Commit to git after switching to workspace and adding CocoaPods in Xcode?
git add .
From the directory enclosing your Xcode project, simply execute a git add .. Documentation here.
Explanation
You likely had the following hierarchy prior pod init:
In all likelihood, your git setup starts at the directory enclosing .xcodeproj.
After pod install, the hierarchy did not change. You merely have more files at the same level:
The .xcworkspace is next to .xcodeproj, not above. You are free to execute
git add ....followed by
git commit -m "message"...assuming that .gitignore is set up properly, and wether or not you prefer to commit the Pods directory.