Update readme

examples/Keyboard/Keyboard.kicad_pro

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+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "board_outline_line_width": 0.038099999999999995,
+        "copper_line_width": 0.254,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.524,
+        "copper_text_size_v": 1.524,
+        "copper_text_thickness": 0.30479999999999996,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.049999999999999996,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": false,
+          "text_position": 0,
+          "units_format": 1
+        },
+        "fab_line_width": 0.09999999999999999,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.09999999999999999,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 1.152,
+          "height": 1.152,
+          "width": 1.152
+        },
+        "silk_line_width": 0.09999999999999999,
+        "silk_text_italic": false,
+        "silk_text_size_h": 0.6,
+        "silk_text_size_v": 0.7999999999999999,
+        "silk_text_thickness": 0.09999999999999999,
+        "silk_text_upright": false,
+        "zones": {
+          "45_degree_only": false,
+          "min_clearance": 0.254
+        }
+      },
+      "diff_pair_dimensions": [
+        {
+          "gap": 0.0,
+          "via_gap": 0.0,
+          "width": 0.0
+        },
+        {
+          "gap": 0.16,
+          "via_gap": 0.0,
+          "width": 0.16
+        }
+      ],
+      "drc_exclusions": [
+        "hole_clearance|140770000|45100000|33c388d5-df7f-4808-9dcb-40b4d3f3b286|696c4f65-4297-4df4-99e5-33af22dfb9a8",
+        "hole_clearance|140770000|45300000|33c388d5-df7f-4808-9dcb-40b4d3f3b286|b00849fc-cd6e-479c-821c-2ae2016c09d3",
+        "hole_clearance|140770000|50700000|47bf8b08-fa80-4c42-9604-b5659499df32|b633782e-99bc-4df8-b211-058366e7fc43",
+        "hole_clearance|140770000|50900000|47bf8b08-fa80-4c42-9604-b5659499df32|40574199-dac6-42d4-92b3-0c2c2d22de9c"
+      ],
+      "meta": {
+        "filename": "board_design_settings.json",
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "error",
+        "clearance": "error",
+        "connection_width": "warning",
+        "copper_edge_clearance": "error",
+        "copper_sliver": "warning",
+        "courtyards_overlap": "error",
+        "diff_pair_gap_out_of_range": "error",
+        "diff_pair_uncoupled_length_too_long": "error",
+        "drill_out_of_range": "error",
+        "duplicate_footprints": "warning",
+        "extra_footprint": "warning",
+        "footprint": "error",
+        "footprint_type_mismatch": "error",
+        "hole_clearance": "error",
+        "hole_near_hole": "error",
+        "invalid_outline": "error",
+        "isolated_copper": "warning",
+        "item_on_disabled_layer": "error",
+        "items_not_allowed": "error",
+        "length_out_of_range": "error",
+        "lib_footprint_issues": "warning",
+        "lib_footprint_mismatch": "warning",
+        "malformed_courtyard": "error",
+        "microvia_drill_out_of_range": "error",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "warning",
+        "net_conflict": "warning",
+        "npth_inside_courtyard": "ignore",
+        "padstack": "error",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "error",
+        "silk_edge_clearance": "warning",
+        "silk_over_copper": "warning",
+        "silk_overlap": "warning",
+        "skew_out_of_range": "error",
+        "solder_mask_bridge": "ignore",
+        "starved_thermal": "ignore",
+        "text_height": "warning",
+        "text_thickness": "warning",
+        "through_hole_pad_without_hole": "error",
+        "too_many_vias": "error",
+        "track_dangling": "warning",
+        "track_width": "error",
+        "tracks_crossing": "error",
+        "unconnected_items": "error",
+        "unresolved_variable": "error",
+        "via_dangling": "warning",
+        "zones_intersect": "error"
+      },
+      "rule_severitieslegacy_courtyards_overlap": true,
+      "rule_severitieslegacy_no_courtyard_defined": false,
+      "rules": {
+        "allow_blind_buried_vias": false,
+        "allow_microvias": false,
+        "max_error": 0.005,
+        "min_clearance": 0.127,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.01,
+        "min_hole_clearance": 0.254,
+        "min_hole_to_hole": 0.5,
+        "min_microvia_diameter": 0.19999999999999998,
+        "min_microvia_drill": 0.09999999999999999,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.7,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.127,
+        "min_via_annular_width": 0.049999999999999996,
+        "min_via_diameter": 0.6,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 5,
+          "td_on_pad_in_zone": false,
+          "td_onpadsmd": true,
+          "td_onroundshapesonly": false,
+          "td_ontrackend": false,
+          "td_onviapad": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [
+        0.0,
+        0.16,
+        0.2,
+        0.5,
+        1.0
+      ],
+      "via_dimensions": [
+        {
+          "diameter": 0.0,
+          "drill": 0.0
+        },
+        {
+          "diameter": 0.7,
+          "drill": 0.3
+        },
+        {
+          "diameter": 0.9,
+          "drill": 0.5
+        }
+      ],
+      "zones_allow_external_fillets": false,
+      "zones_use_no_outline": true
+    },
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "Keyboard.kicad_pro",
+    "version": 1
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.15,
+        "diff_pair_gap": 0.15,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.15,
+        "line_style": 0,
+        "microvia_diameter": 0.6858,
+        "microvia_drill": 0.3302,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.15,
+        "via_diameter": 0.7,
+        "via_drill": 0.3,
+        "wire_width": 6
+      },
+      {
+        "bus_width": 12,
+        "clearance": 0.15,
+        "diff_pair_gap": 0.15,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.15,
+        "line_style": 0,
+        "microvia_diameter": 0.6858,
+        "microvia_drill": 0.3302,
+        "name": "Power",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.7,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 3
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": [
+      {
+        "netclass": "Power",
+        "pattern": "vtarget"
+      },
+      {
+        "netclass": "Power",
+        "pattern": "v3v3"
+      },
+      {
+        "netclass": "Power",
+        "pattern": "vusb"
+      },
+      {
+        "netclass": "Power",
+        "pattern": "gnd"
+      }
+    ]
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "Keyboard.net",
+      "specctra_dsn": "",
+      "step": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "drawing": {
+      "label_size_ratio": 0.25,
+      "pin_symbol_size": 0,
+      "text_offset_ratio": 0.08
+    },
+    "legacy_lib_dir": "",
+    "legacy_lib_list": []
+  },
+  "sheets": [],
+  "text_variables": {}
+}