chore: enforce commit message conventions (swagger-api#6577)

* chore: enforce commit message conventions

* docs: add link to contributing in README

.commitlintrc.json

@@ -0,0 +1,25 @@
+{
+  "extends": [
+    "@commitlint/config-conventional"
+  ],
+  "rules": {
+    "header-max-length": [
+      2,
+      "always",
+      69
+    ],
+    "scope-case": [
+      2,
+      "always",
+      [
+        "camel-case",
+        "kebab-case",
+        "upper-case"
+      ]
+    ],
+    "subject-case": [
+      0,
+      "always"
+    ]
+  }
+}

.huskyrc

@@ -0,0 +1,6 @@
+{
+  "hooks": {
+    "pre-commit": "lint-staged",
+    "commit-msg": "commitlint -E HUSKY_GIT_PARAMS"
+  }
+}

.lintstagedrc

@@ -0,0 +1,3 @@
+{
+  "*.js": "eslint"
+}

README.md

@@ -57,6 +57,9 @@ Swagger UI Version | Release Date | OpenAPI Spec compatibility | Notes
 - [Setting up](docs/development/setting-up.md)
 - [Scripts](docs/development/scripts.md)
 
+#### Contributing
+- [Contributing](https://github.com/swagger-api/.github/blob/master/CONTRIBUTING.md)
+
 ##### Integration Tests
 
 You will need JDK of version 7 or higher as instructed here