Create CONTRIBUTING.md

Author: dsentker

CONTRIBUTING.md

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+# Contributing
+
+Thank you for taking the time to help us - Contributions are **welcome** and will be fully **credited**.
+
+We do all our work on GitHub. If you'd like to help, you can create a
+[free GitHub account here](https://github.com/join).
+
+## Reporting an issue
+
+For bug reports or feature requests, [please create a new issue](https://github.com/dsentker/phpinsights/issues).
+
+Before filing an issue:
+
+- Attempt to replicate the problem, to ensure that it wasn't a coincidental incident.
+- Check to make sure your feature suggestion isn't already present within the project.
+- Check the pull requests tab to ensure that the bug doesn't have a fix in progress.
+- Check the pull requests tab to ensure that the feature isn't already in progress.
+
+## Submitting changes
+
+The best way to submit a bug fix or improvement is through a [pull request](https://help.github.com/articles/creating-a-pull-request-from-a-fork/).
+
+**Document any change in behaviour** - Make sure the `README.md` and any other relevant documentation are kept up-to-date.