Keyboard shortcut for "Assign to map center"

[Robert Menger]

Dear developers of kgeotag,


Im currently geotagging my entire collection of thousands of pictures, 
where every picture was taken at a different spot and I need to select 
that spot on the map an than assign the current map-position to the image.

Works pretty well except that a keyboard-shortcut is missing to perform 
that action to the current selection (or if nothing is selected the 
topmost image).


Is there a way to implement a new shortcut? If someone could point me to 
the right direction in the code (and a tutorial how to build), I could 
also create a PR on GH.


best

Robert