Update CONTRIBUTING.md (#55)

Author: conaticus

CONTRIBUTING.md

@@ -5,6 +5,8 @@ Hello and thank you for checking out the contributing guidelines for Boolean! Pl
 ## Issues
 All tasks for the project are listed in the repo's [issues](https://github.com/conaticusgrp/boolean-revamp/issues). Feel free to work on any issue that does not have an assignee. There is no guarantee this issue has not already been worked on - it's good to check the PRs page first.
 
+**Ensure that you remote the develop branch and not the main branch.**
+
 ## Command Conventions
 - Use the necessary attribute or create one in Precondition.cs for commands/command groups that require an item from the database
 - Prefer using discord embeds instead of standard text replies