Cloning this repository:

git clone git://gitorious.org/simplefdtd/simplefdtd.git simplefdtd
cd simplefdtd

Add this repository as a remote to an existing local repository:

git remote add simplefdtd git://gitorious.org/simplefdtd/simplefdtd.git
git fetch simplefdtd
git checkout -b my-local-tracking-branch simplefdtd/master_or_other_branch