Create CONTRIBUTING.md

CONTRIBUTING.md

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+## How can I contribute ?
+
+### Code contribution
+
+#### Issues
+
+If you are unsure where to begin contribution to Num2Words, you can start by looking through the issues page.
+Numerous issues are created and waiting for your love on the [issue board](https://github.com/savoirfairelinux/num2words/issues).
+
+#### Pull Requests
+
+Contributions will be accepted through the creation of Pull Requests. Here is the workflow:
+
+* Fork the repository into yours and work from there
+* Commit and push your changes into your fork
+* When you are done, create a [Pull Request](https://github.com/savoirfairelinux/num2words/compare) on the **master** branch
+
+A template is provided to create your Pull Request. Try to fill the information at the best of your knowledge.
+
+#### Pull request checklist
+
+For your pull request to be merged, the answer to the following questions must be 'yes':
+
+##### General
+
+* Can the branch be merged automatically?
+
+##### Testing
+
+* Do the unit tests pass?
+
+##### Adding new code
+
+* Is the code PEP8 compliant?
+* Is the code covered by tests?
+
+[TravisCI](https://travis-ci.org/) is configured to run those checks on every Pull-Request. It is recommanded you configure your fork to do the same.
+
+### Reporting bugs
+
+Bugs are tracked as [GitHub issues](https://guides.github.com/features/issues/).
+
+#### How to submit a good bug report
+
+Please include as many details as possible. An issue template is automatically loaded when you create an issue.
+
+* Use a clear and comprehensive title for the issue
+* Describe the expected behaviour in as many details as possible
+* Describe the actual behaviour in as many details as possible
+
+### Testing the application
+
+Our development process is based on Continuous Integration. We love to have a nice code coverage!