First, clone your repo into an empty directory.
Then, in the new repo, create and check out a new branch to work with friends. The branch point should be the last commit in which you both had the same source (maybe your initial commit).
Then you copy your sources to a new tree. Git status / diff should now show the changes it made.
Make a git commit on this branch, and you should have one repo from both development branches.
Make a git merge master to merge your work (which is in the master branch) into a new branch of your colleagues. Have fun resolving conflicts, commit, and you're done.
If you want the changes to be returned to your own repo, you can pull or fetch from your repo using the ssh:// URL if you have ssh access to the machine or file:/// if you can see it directly.
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