How to add an existing Xcode project to git

cd projectfolder/

find . | grep "UserInterfaceState.xcuserstate"

if the file exists add it to the .gitignore file

find . | grep "UserInterfaceState.xcuserstate" > .gitignore

check everything is OK

cat .gitignore

Initialise git

git init

Add all the files to git

git add .

Commit the files to git with a comment to say why

git commit - m "initial commit"

If you have git issues, you may need to install command line tools from Xcode preferences.