That's my project for today as well. I found this very helpful answer on StackOverflow using the GitHub GUI:
http://stackoverflow.com/a/15816653/1177139
I plan to create our WindRiver project normally, then follow the instructions in that answer to create a Git repo at that folder and sync it to GitHub. For setting it up on other team members' computers, I'll try following this guy's process:
https://github.com/vcarl/FRC830-Prot...b-to-WindRiver
I'll post again with my results...someone has run off with our WindRiver CDs at the moment.