Resolve #8 contribution guidelines [ci skip]

CONTRIBUTING.md

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+# Contributing
+
+## Bug reports, suggestions
+
+- File all your issues, feature requests [here](https://github.com/interactive-pioneers/iptools-jquery-genericfilter/issues)
+- If filing a bug report, follow the convention of _Steps to reproduce_ / _What happens?_ / _What should happen?_
+- __If you're a developer, write a failing test instead of a bug report__ and send a Pull Request
+
+## Code
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+2. Install all dependencies (`npm i && bundle`)
+3. Develop your feature by concepts of [TDD](http://en.wikipedia.org/wiki/Test-driven_development), see [Tips](#tips)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request
+
+## Tips
+
+Following tasks are there to help with development:
+
+- `npm start` (aka `npm run grunt watch:bdd`) listens to tests and source, reruns tests
+- `npm test` (aka `npm run grunt qa`) run QA task that includes tests and JSHint
+- `npm run grunt build` minify source to dist/