docs: add CONTRIBUTING.md file

CONTRIBUTING.md

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+# Contributing
+
+## 1. Default Branch Name
+Use `master` as root branch name.
+
+## 2. Initial Commit
+Initialize repository and it's first commit without any content included:
+```bash
+git commit --allow-empty -m "init"
+```
+
+## 3. Conventional Commits
+Use the [Conventional Commits](https://www.conventionalcommits.org/) specification for commit messages.
+Examples:
+- `feat(cli): add a new cli feature`
+- `fix(parser): resolve a bug`
+- `docs: update documentation`
+- `chore: general maintenance or tooling changes`
+
+Clear commit messages make the history easier to read and improve collaboration.
+
+Additionaly, consider making more smaller commits than one bigger.
+
+## 4. Semantic Versioning
+Adhere to [Semantic Versioning (SemVer)](https://semver.org/) for project versioning:
+- `MAJOR`: Breaking changes
+- `MINOR`: New features, backward compatible
+- `PATCH`: Bug fixes, backward compatible
+
+Proper versioning ensures users and contributors understand the impact of updates.