Cloning this repository:

git clone git://gitorious.org/wireshark-esp/wireshark-esp.git wireshark-esp
cd wireshark-esp

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

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