doc: design diagram

doc/design.md

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+# Design
+
+## Class Diagram
+
+### Legend
+
+```mermaid
+flowchart TB
+    classDef cls fill:88ff88,color:black
+
+    subgraph Inheritance 
+        b[Base Class]:::cls
+        d[Derived Class]:::cls
+    end
+    d --|> b
+
+    subgraph Ownership
+       c[Class]:::cls
+       o[Object owned by Class]:::cls
+    end
+    c --> o
+```
+
+### Iguana Design
+
+```mermaid
+flowchart TB
+    classDef cls fill:88ff88,color:black
+    classDef algo fill:ff8888,color:black
+
+    subgraph iguana
+        Iguana:::cls
+    end
+
+    subgraph services
+        Algorithm:::cls
+        AlgorithmConfig:::cls
+        Logger:::cls
+    end
+
+    subgraph algorithms
+        FiducialCuts:::algo
+        FiducialCutsConfig:::algo
+        MomentumCorrection:::algo
+        MomentumCorrectionConfig:::algo
+    end
+
+    Iguana    --> Logger
+    Iguana    --> Algorithm
+    Algorithm --> Logger
+    Algorithm --> AlgorithmConfig
+
+    FiducialCuts       --|> Algorithm
+    FiducialCutsConfig --|> AlgorithmConfig
+    MomentumCorrection       --|> Algorithm
+    MomentumCorrectionConfig --|> AlgorithmConfig
+```