Add contributing guide section README

Author: seadowg

README.md

@@ -10,3 +10,11 @@
 6. Install npm 3.10.10 (`npm install -g [email protected]`)
 7. Install gulp
 8. Install chromedriver
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+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