Create CONTRIBUTING.md

.github/CONTRIBUTING.md

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+## Submitting issues
+
+* Please search the existing issues first, it's likely that your issue was already reported or even fixed.
+  - Go to "Issues" and type any word in the top search/command bar.
+  - Consider to search on closed issues. To do that just remove "is:open" from the search field.
+  - More info on [search syntax within github](https://help.github.com/articles/searching-issues)
+* Report the issue using our [template][template], it includes all the information we need to track down the issue.
+
+Help us to maximize the effort we can spend fixing issues and adding new features, by not reporting duplicate issues.
+
+[template]: https://github.com/saenzramiro/rambox/blob/master/.github/ISSUE_TEMPLATE.md
+
+## Share your Custom Services
+
+If you consider there are other users that can use your Custom Service, we have a repo for this: [Rambox Services Contrib][rambox-services-contrib].
+
+[rambox-services-contrib]: https://github.com/saenzramiro/rambox-services-contrib
+
+## Ask for help
+
+We have a great community in [Gitter][gitter] that can help you with any doubt or problem.
+
+[gitter]: https://gitter.im/saenzramiro/rambox
+
+## Contributing to Source Code
+
+Feel free to create pull requests to help us offer a great and complete software. :wink:
+
+## Translations
+Please submit translations via [Transifex][transifex].
+
+[transifex]: https://www.transifex.com/rambox/rambox-app/