Restore CONTRIBUTING.md

Added back CONTRIBUTING.md since it accidentally got deleted in a previous pull request

CONTRIBUTING.md

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+# Contributing
+Thank you for investing your time and contributing to Legup! In this guide, you will get an overview of the general principles you should follow when contributing to Legup. Legup is open source software, so anyone and everyone is welcome to contribute to this project. Some of the types of contributions accepted include, but aren't limited to, the following:
+- Developing and maintaining the code
+- Documentation
+- Testing
+
+## Guides
+Please refer to the following guides when contributing:
+- Legup Development Process
+  - [Developer Setup Guide for First-Time Contributors](https://github.com/Bram-Hub/Legup/wiki/Developer-Setup-Guide)
+  - [Programming Standards](https://github.com/Bram-Hub/Legup/wiki/Our-Programming-Standards)
+  - [Suggestions for Getting Started](https://github.com/Bram-Hub/Legup/wiki/Some-Pointers-for-Getting-Started)