creating a contributing file

CONTRIBUTING.md

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+Contributing to AniJS
+=====================
+
+AniJS is like a little girl, she needs [hungry and foolish](http://www.youtube.com/watch?v=7CeNIDWtlo0#t=774) community people to grow up healthy. All your [issues](https://github.com/anijs/anijs/issues), [pull requests](https://github.com/anijs/anijs/pulls) and [stars ;) ](https://github.com/anijs/anijs) are welcome.
+
+1. Fork it!
+2. Create your feature branch: `git checkout -b my-new-feature`
+3. Test your changes.
+4. Commit your changes: `git commit -am 'Add some feature'`
+5. Push to the branch: `git push origin my-new-feature`
+6. Submit a pull request :D
+
+Testing your changes
+--------------------
+AniJS uses the [Jasmine](http://jasmine.github.io/) Behavior Driven Development testing framework.
+
+- Open test/jasmine-standalone/SpecRunner.html in a browser and then run the tests.
+
+- You can add your own tests spec in test/jasmine-standalone/spec.
+
+Please take a look to [Jasmine Documentation](http://jasmine.github.io/2.0/introduction.html) for further information.
+
+Pull Request Requirements
+-------------------------
+  * Complete inline code comments
+  * Unit tests with 80% line coverage
+  * Proper commit logs