Setting up a git repository in Xcode for a pre-existing project

Last answer works OK, but is rather lengthy and incompatible with newer Xcode versions. I will try to reiterate it better:

1. Choose your git repository folder (directory) usually this will be the directory containing the Xcode workspace or project.

2. In that directory, create a text file named ".gitignore", and put the following contents into it:

   UserInterfaceState.xcuserstate
   build
   *.pbxuser
   *.perspectivev3
   *.mode1v3
   *~
   *~.nib
   *~.xib 
   .DS_Store 
   xcuserdata/
   

3. Quit Xcode (If it was open)

4. In Terminal do the following:

   \> cd <path of the repository folder>
   \> git init
   \> git add .
   \> git commit -m "Initial commit - or whatever text you'd prefer"
   

You're done! Open the workspace/project in Xcode and examine your repository in the organizer window.

1. Quit Xcode (not sure if this is necessary but I do it just in case)
2. Run Terminal
3. Get into the project folder directory
4. find .
5. Find the file that says "UserInterfaceState.xcuserstate" and copy the entire filename up to the ./
6. echo "paste the UserInterfaceState.xcuserstate file here" >.gitignore
7. cat .gitignore
8. git init
9. git add .
10. git commit -m "You can type a comment here like now under source control"

You now have a repository and your project is under source control