Add submodule to .gitmodules

git submodule add git://github.com/bitstadium/HockeySDK-iOS.git Vendor/HockeySDK

Check the status

git status

logs:

On branch masterYour branch is up-to-date with 'origin/master'.Changes to be committed:  (use "git reset HEAD..." to unstage)

modified:  .gitmodules

new file:  Vendor/HockeySDK

Commit

git commit -m "Add HockeySDK-iOS as submodule"

Then `git pull` and `git push`.

The content of .gitmodules:

[submodule "Vendor/HockeySDK"]

       path = Vendor/HockeySDK

       url = git://github.com/bitstadium/HockeySDK-iOS.git