Add CONTRIBUTING.md

Author: srmagura

CONTRIBUTING.md

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+# Contributing to react-loading-skeleton
+
+Contributions are welcome.
+
+## Development
+
+1. `yarn install`
+2. `yarn setup` — setup precommit hook
+3. Check for type errors: `yarn tsc`
+4. Run Rollup: `yarn build`
+5. Run tests: `yarn test`
+6. Run ESLint: `yarn lint-all`
+
+## Publishing
+
+1. Make sure that the CI workflow succeeded.
+2. Increment version in `package.json`.
+3. (If production release) Add a git tag in the format `v1.0.0`.
+4. Commit and push. Remember to push tags as well with `git push --tags`.
+5. `yarn npm publish` or `yarn npm publish --tag next`. The `prepack` script will automatically do a clean and build.
+6. (If production release) Create a new release in GitHub.
+
+## Test Projects Repository
+
+There are some test projects that use `react-loading-skeleton` in the
+[react-loading-skeleton-test-projects](https://github.com/srmagura/react-loading-skeleton-test-projects)
+repository.