Add contribution tips for new users.

.github/CONTRIBUTING.md

@@ -0,0 +1,15 @@
+In order to contribute to the repository:
+
+- Fork the repository
+- Clone your fork locally
+- Install dependencies via `yarn` or `npm i`
+- Make your changes and commit them
+- Open your PR with the description of changes
+
+The automated CI on PRs will help you with quality assurance, testing, best practices and accessibility issue detections.
+
+You can also run it locally via commands:
+
+- `yarn lint:all` or `npm run lint:all` in the root directory for linting
+- `yarn type-check:watch` or `npm run type-check:watch` in the root directory for type checking via TypeScript
+- `yarn test:e2e:dev` or `npm run test:e2e:dev` in the example project directories for running E2E test via Cypress

README.md

@@ -237,6 +237,12 @@ CMS.init({
 
 For NetlifyCMS specific issues visit the [official documentation](https://www.netlifycms.org/docs/intro/).
 
+### Contributing
+
+If you have any issues, questions or suggestions related to the starter then feel free to bring them up!
+
+If you'd like to contribute to the repository and need some pointers, take a look at the [Contribution Guide](./.github/CONTRIBUTING.md).
+
 # Author
 
 Ruben Harutyunyan ([@Vagr9K](https://twitter.com/Vagr9K))