adding github directory

.github/CONTRIBUTING.md

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+# Contributing
+
+Hi! Thank your for considering contributing to Gotenberg. You'll
+find below useful information about how to contribute to the Gotenberg project.
+
+## Contributing code
+
+### Install from sources
+
+1. Fork this repository
+2. Clone it to your local Go environment (requires *Go* >= 1.10)
+5. Install the latest [Orbit](https://github.com/gulien/orbit) release
+
+### Working with git
+
+1. Create your feature branch (`git checkout -b my-new-feature`)
+2. Commit your changes (`git commit -am 'Add some feature'`)
+3. Push to the branch (`git push origin my-new-feature`)
+4. Create a new pull request
+
+## Reporting bugs and feature request
+
+Your issue or feature request may already be reported!
+Please search on the [issue tracker](../../../issues) before creating one.
+
+If you do not find any relevant issue or feature request, feel free to
+add a new one!
+
+## Additional resources
+
+* [Code of conduct](CODE_OF_CONDUCT.md)
+* [Issue template](ISSUE_TEMPLATE.md)
+* [Pull request template](PULL_REQUEST_TEMPLATE.md)