Create CONTRIBUTING.md

Author: corsonr

CONTRIBUTING.md

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+# Contributing
+
+I would love for you to contribute to Fredo and help me make this even better! Start reading this document to see it is not difficult as you might have imagined.
+
+
+## Table of Contents
+
+- [Open an Issue](#open-an-issue)
+- [Submit a Pull Request](#submit-a-pull-request)
+- [License](#license)
+
+
+## Open an Issue
+
+[Open an Issue](../../../issues/new) to report any problems or improvements. Be sure to include some description to explain the problem.
+
+
+## Submit a Pull Request
+
+To submit a new feature, make sure that changes are done to the source code. Follow WordPress coding standards and do not forget to test your code before pushing it.
+
+Try to solve a problem for each pull request, this increases the chances of acceptance. When in doubt, open a [new issue](#open-an-issue) so I can answer you. Look at existing issues for ideas or to see if a similar issue has already been submitted.
+
+1. Fork the Github repo: `git clone https://github.com/corsonr/fredo.git`
+1. Create a new branch: `git checkout -b issuenumber-feature-name`
+1. Commit your changes: `git commit -m 'issuenumber-feature-name'`
+1. Push to the branch: `git push origin my-feature-name`
+1. Submit a pull request!
+
+## License
+
+By contributing your code, you agree to license your contribution under the GNU General Public License v3.0.