📝 Update README with contribution and license section

Signed-off-by: Jakub Juszczak <[email protected]>

Author: apertureless

README.md

@@ -142,3 +142,15 @@ npm test
 ```
 
 For detailed explanation on how things work, checkout the [guide](http://vuejs-templates.github.io/webpack/) and [docs for vue-loader](http://vuejs.github.io/vue-loader).
+
+## Contributing
+
+1. Fork it ( https://github.com/aapertureless/vue-chartjs/fork )
+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 a new Pull Request
+
+## License
+
+This software is distributed under [MIT license](LICENSE.txt).