Update and rename contributing.md to CONTRIBUTING.md

contributing.md → CONTRIBUTING.md

@@ -3,6 +3,8 @@
 1. [Fork](https://help.github.com/articles/fork-a-repo/) this repository to your own GitHub account and then [clone](https://help.github.com/articles/cloning-a-repository/) it to your local device.
 2. Install the dependencies: `npm install`.
 3. Run `npm link` to link the local repo to NPM.
-4. Run `npm run build` to build and watch for code changes.
+4. Run `npm run build` to build or `npm run watch` to build and watch for code changes.
 5. Then npm link this repo inside any example app with `npm link nuxt`.
-6. Then you can run your example app with the local version of Nuxt.js (You may need to re-run the example app as you change server side code in the Nuxt.js repository).
+6. Then you can run your example app with the local version of Nuxt.js (You may need to re-run the example app as you change server side code in the Nuxt.js repository).
+
+Make sure to add tests into `test/` directory and try them with `npm test` before making a pull request.