Add some package level documentation
Add some package level documentation

Although many of the functions have docstrings, I never quite got
around to adding package level documentation.  Not even a one-line
overview.

Until now.

qur/gopy,limetext/gopy,qur/gopy,limetext/gopy,qur/gopy,ericsnowcurrently/qur-gopy,ericsnowcurrently/qur-gopy,ericsnowcurrently/qur-gopy,limetext/gopy