Add CONTRIBUTING.md

Author: stefvhuynh

CONTRIBUTING.md

@@ -0,0 +1,23 @@
+Thanks for contributing!
+
+## Development
+
+### Installing dependencies
+
+```bash
+npm install
+```
+
+### Demo
+
+You can run the demo locally by simply doing `npm start`; this will start the demo at `http://localhost:3000`.
+
+### Linting
+
+Before commiting any changes, be sure to do `npm run lint`; this will lint all relevant files using [ESLint](http://eslint.org/) and report on any changes that you need to make. You can also run `npm run lint-fix` to fix most common lint errors automatically.
+
+## Releasing a new version to NPM (only for project administrators):
+
+1. Run `npm version patch` (or `minor`, `major` as appropriate) to lint and build the `lib` and `umd` directories.
+2. Run `npm publish` and publish to NPM if all is well.
+3. Run `git push && git push --tags`