docs: add contributing doc

CONTRIBUTING.md

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+# Commit Type Guideline
+  * build: changes that affect the build system or external dependencies (example scopes: npm, pip, rg)
+  * ci: changes to CI configuration files and scripts (example scopes: format, lint, issue_templates)
+  * docs: changes to the documentation only
+  * feat: new feature for the user
+  * fix: bug fix
+  * perf: performance improvement
+  * refactor: code change that neither fixes a bug nor adds a feature
+  * test: adding missing tests or correcting existing tests
+  * chore: all the rest, including version bump for plugins