My next article of the series devoted to migrating macros to add-ins (after migrating macro methods and macro environment events) is about keyboard shorcuts for macro commands:

HOWTO: Create a keyboard shortcut (binding) to Visual Studio add-in command
http://www.mztools.com/articles/2013/MZ2013018.aspx

Don’t miss this other article if you are using non-English versions of Visual Studio:

BUG: Command.Bindings causes Exception when setting value from an add-in in localized Visual Studio.
http://www.mztools.com/articles/2012/MZ2012021.aspx