Add contributing guidelines

CONTRIBUTING.md

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+# Contributing
+
+We welcome all contributions, no matter how big or small.
+
+## Report an Issue
+
+If you think you've found a bug in magicLAMP, then please [report an issue](https://github.com/chrisnharvey/magicLAMP/issues/new?assignees=&labels=&template=bug_report.md&title=)
+using the GitHub issue tracker for the project.
+
+Please provide as much detail as you can and follow the issue template as much as possible.
+
+## Documentation Issues
+
+If you've found an issue with the documentation, or would like to improve it in any way, then
+we encourage that you don't open an issue, and instead submit a pull request with your proposed changes.
+
+Our documentation is written in Markdown and GitHub has a built-in editor for markdown files. Just find
+the file you want to amend, and click the edit button. GitHub will then guide you through the process of
+submitting your change to the project.
+
+## Request a Feature
+
+Before submitting a Pull Request with a new feature, we suggest that you first [propose the feature](https://github.com/chrisnharvey/magicLAMP/issues/new?assignees=&labels=&template=feature_request.md&title=)
+in the issue tracker. This will allow us to discuss your feature request and decide whether or not
+we think its right for the project.
+
+## Pull Requests
+
+When submitting code changes to magicLAMP, please follow the following guidelines.
+
+- **Document any change in behaviour** - Make sure the documentation and `README.md` is kept up-to-date.
+
+- **Submit to the correct branch** - Bug fixes should be targeted branch for the latest stable version (e.g. 1.x). Only target the master branch if your you're fixing an issue that only exists in that branch.
+
+- **Create feature/fix specific branches** - Don't ask us to pull from your master branch.
+
+- **One pull request per feature/fix** - If you want to do more than one thing, send multiple pull requests.
+
+- **Send coherent history** - Make sure each individual commit in your pull request is meaningful. If you had to make multiple intermediate commits while developing, please [squash them](http://www.git-scm.com/book/en/v2/Git-Tools-Rewriting-History#Changing-Multiple-Commit-Messages) before submitting.
+
+**Happy coding**!