Add Support for Hammerspoon dotfolder

[heysupratim]

Hammerspoon is an open-source automation framework for mac that uses Lua scripting and it stores its user-made scripts in the .hammerspoon directory under the user home directory.

For reference see hammerspoon.org/

[alichtman]

If you would like this to be backed up, just modify your config file to include this dotfolder. If you're suggesting to have this backed up by default, feel free to open a PR.