docs(contributing): add documaentation for contributing

Author: rolandszoke

CONTRIBUTING.md

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+# Contributing
+
+## Issues
+
+Issues are precious to this project.
+
+- **Ideas** are a valuable source of contributions others can make
+- **Problems** show where this project is lacking
+- With a **question**, you show where contributors can improve the user experience
+
+Thank you for creating them.
+
+## Commits
+
+Your commit messages should follow Angular [commit convention](https://www.conventionalcommits.org/en/v1.0.0-beta.4/). Therefore we are linting your commits with [Husky](https://github.com/typicode/husky), meaning you cannot create a non-conventional commit message. If you squash merge your pull request, please make sure you also follow the commit convention in your squashed commit message.
+
+## Pull Requests
+
+Pull requests are a great way to get your ideas into this repository.
+You should be clear which problem you're trying to solve with your contribution.
+Every pull request will require an approved review before merging.
+
+## Linters
+
+This project is using [ESLint](https://eslint.org/) for linting and [Prettier](https://prettier.io/) for code formatting. Please follow their standards on contributing. Your code is automatically formatted on saving a file when using [VSCode](https://code.visualstudio.com/) or [Atom](https://atom.io/). [Husky](https://github.com/typicode/husky) ensures that your changes are properly linted before making a commit. If you want to lint manually, you can use `lint` and `lint-fix` npm scripts to lint the source code and `lint-tests` and `lint-tests-fix` to lint the test files.
+
+## Tests
+
+To run tests use `npm t` script. We are using [Jest](https://jestjs.io/) and [React Testing Library](https://github.com/testing-library/react-testing-library) for testing. Consider creating new test cases when necessary under the `__tests__` folder, we want to keep our test covarage above 90%. Use `.test.js` or `.test.jsx` suffix for test files and `.test.native.js` or `.test.native.jsx` for native tests.
+
+## Build process
+
+TODO