Tips:How to add other documentation in Xcode 5?

Here are the terminal commands to install the documentation manually
Example for the Sparrow Framework........

cd ~/Library/Developer/Shared/Documentation/DocSets
curl -O "http://doc.sparrow-framework.org/core/feed/com.gamua.Sparrow-Framework-2.0.xar"
xar -x -f "com.gamua.Sparrow-Framework-2.0.xar"
rm "com.gamua.Sparrow-Framework-2.0.xar"