Configure files for terraformbot (#82)

* Create CODEOWNERS

* Create autoAssignees.yml

* Create labeler.yml

* Update CODEOWNERS

.github/CODEOWNERS

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+os/ @metacpp
+test/ @junyiyi
+*.tf @tf-owner

.github/autoAssignees.yml

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+labelToAuthor: {
+  "bug": [metacpp]
+  "cla-already-signed": []
+  "cla-not-required": []
+  "cla-required": []
+  "cla-signed": []
+  "design discussion": []
+  "duplicate": []
+  "enhancement": []
+  "help wanted": []
+  "invalid": []
+  "kitchen": []
+  "microsoft/P2": []
+  "microsoft/P3": []
+  "need review": []
+  "not reproduced": []
+  "question": []
+  "rake": []
+  "ready to merge": []
+  "review": []
+  "size/M": []
+  "size/S": []
+  "terraform": []
+  "testing": []
+  "upstream provider": []
+  "wontfix": []
+}

.github/labeler.yml

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+# Number of labels to fetch (optional). Defaults to 20
+numLabels: 40
+# These labels will not be used even if the issue contains them (optional). 
+# Pass a blank array if no labels are to be excluded.
+# excludeLabels: []
+excludeLabels:
+  - pinned