Fork the main branch and clone your fork. Setup git lfs by running git lfs install. Setup Unity's merge tool in your local repository's git config (.git\config):
[merge]
tool = unityyamlmerge
[mergetool "unityyamlmerge"]
trustExitCode = false
# Replace with your editor's installation path
cmd = 'C:\\Program Files\\Unity\\Hub\\Editor\\UNITY_VERSION\\Editor\\Data\\Tools\\UnityYAMLMerge.exe' merge -p "$BASE" "$REMOTE" "$LOCAL" "$MERGED"