Create CONTRIBUTING.md

CONTRIBUTING.md

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+## How to Contribute
+
+#### Setting up development environment 
+
+1. Fork the repository and create your branch from master.
+2. To install the project: `yarn install`
+3. Running tests: `yarn test` or `yarn test:watch`
+4. Running dev environment to work on `yarn storybook` and head to [https://localhost:6006](https://localhost:6006)
+
+
+#### Issuing a change
+
+1. Push to github.
+2. If you’ve fixed a bug or added code that should be tested, add tests.
+3. Open a Pull Request with the following guidelines:
+   - Set title prefix to feature/bug and supply a descriptive PR title.
+   - Add description to your Pull Request describing your change.
+4. Once your Pull Request is issued  the test suite and build processes will run and we will review your change.
+