docs: add CONTRIBUTING guide

CONTRIBUTING.md

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+# Contributing
+
+## Development workflow
+
+To get started with the project, run `yarn` in the root directory to install the required dependencies for each package:
+
+```sh
+yarn
+```
+
+### Commit message convention
+
+We follow the [conventional commits specification](https://www.conventionalcommits.org/en) for our commit messages:
+
+- `fix`: bug fixes, e.g. fix crash due to deprecated method.
+- `feat`: new features, e.g. add new method to the module.
+- `refactor`: code refactor, e.g. migrate from class components to hooks.
+- `docs`: changes into documentation, e.g. add usage example for the module..
+- `test`: adding or updating tests, e.g. add integration tests using detox.
+- `chore`: tooling changes, e.g. change CI config.
+
+Our pre-commit hooks verify that your commit message matches this format when committing.
+
+### Linting and tests
+
+[ESLint](https://eslint.org/), [Prettier](https://prettier.io/), [TypeScript](https://www.typescriptlang.org/)
+
+We use [TypeScript](https://www.typescriptlang.org/) for type checking, [ESLint](https://eslint.org/) with [Prettier](https://prettier.io/) for linting and formatting the code.
+
+Our pre-commit hooks verify that the linter and format pass when committing.
+
+## Code Review
+
+During the code review, we aim to improve the overall product quality.
+
+- Reviews should be concise and written in neutral language. Critique the code, not the author, and be respectful.
+- Over-communicate your thoughts in the initial message, as it saves time on back and forth communication cycles.
+
+### Merge Review
+
+The PR commit messages will play an essential role in our release process. Use squash and rebase for reorganizing the messages so they are self-contained and explanatory.
+
+### Useful links
+
+- [Auto-squashing Git Commits](https://thoughtbot.com/blog/autosquashing-git-commits)
+- [Code Review Developer Guide](https://google.github.io/eng-practices/review/)
+- [Respectful Code Reviews](https://chromium.googlesource.com/chromium/src/+/master/docs/cr_respect.md)