chore: add contributing guidelines

Author: cironunes

CONTRIBUTING.md

@@ -0,0 +1,21 @@
+# Contributing
+
+There are two main ways to contribute to this project.
+
+## Content
+
+* Write articles
+* Recording screencasts
+* Submit presentations
+
+## Development
+
+1. Fork it! ( https://github.com/cironunes/generator-angular-next/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](https://github.com/cironunes/generator-angular-next/compare):D
+
+
+English is the universal language nowadays, so please don't create or comment on issues using another language.
+

README.md

@@ -138,6 +138,10 @@ A `navService` has just two methods: `activate` and `deactivate`.
 
 Add or remove a class to open/hide the nav with CSS
 
+## Contributing
+
+Please see the [contributing guidelines](https://github.com/cironunes/angular-off-canvas/blob/master/CONTRIBUTING.md)
+
 ## Tests
 
 You can run the tests with [`karma`](http://karma-runner.github.io/0.10/index.html):