CONTRIBUTING file added

Author: nikolasp

CONTRIBUTING.md

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+# Contributing
+
+Contributions are **welcome** and will be fully **credited**.
+
+We accept contributions via Pull Requests on [Github](https://github.com/Vivify-Ideas/vue-draggable).
+
+## Pull Requests
+
+- **Keep the same style** - eslint will automatically be ran before committing
+
+- **Document any change in behaviour** - Make sure the `README.md` and any other relevant documentation are kept up-to-date.
+
+- **Consider our release cycle** - We try to follow [SemVer v2.0.0](http://semver.org/). Randomly breaking public APIs is not an option.
+
+- **Create feature branches** - Don't ask us to pull from your master branch.
+
+- **One pull request per feature** - If you want to do more than one thing, send multiple pull requests.
+
+- **Send coherent history** - Make sure your commits message means something
+
+
+## Running
+
+Launch example
+
+``` bash
+$ npm run dev
+```
+
+**Happy coding**!