Create CONTRIBUTING.md

Author: zweilosec

CONTRIBUTING.md

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+**If you would like to add to, modify, or improve anything in my notes, PLEASE DO!**
+
+If you would like to give suggestions or even commit changes to these pages feel free to head to my GitHub page at:
+
+{% embed url="https://github.com/zweilosec/Infosec-Notes" caption="" %}
+
+### How to contribute
+
+1. [Create an Issue Request](https://github.com/zweilosec/Infosec-Notes/issues) describing your changes/additions.
+2. Fork [this repository](https://github.com/zweilosec/Infosec-Notes).
+3. Push some code to your fork.
+4. Come back to this repository and [open a pull request](https://github.com/zweilosec/Infosec-Notes/pulls).
+5. After reviewing your changes, I will merge your pull request to the master repository.
+6. Make sure to update your Issue Request so that I can credit you! Thank you so much!
+
+Feel free to also open an issue with any questions, help wanted, or requests!  
+
+Throughout these notes I have put `TODO:` notes that indicate that I know a certain section needs work.  Focus on these if you can!
+
+```bash
+TODO: Change all code examples to use variables (e.g. $host_ip)
+rather than fill-in-the-blank format (e.g. <host_ip>). 
+This will help greatly with copying code directly into scripts.
+```