Libraries have to be compiled in a different way to normal code so the current features that allow you to share code between projects won't work for you. We have some things coming along for shared local libraries.

However you might find a solution as follows:-

Place your libraries in the official arduino library area normally documents\arduino\libraries.

Add a C++ project to the solution for each library

Visual micro should detect lib changes and recompile but if you add new source code files to a library you just need to click "Tools>Visual Micro>reload tool chains"

There is a new facility in visual micro that allows for libraries below each project but then you won't be able to share them so that will be the next addition.

So where would be the best physical place for git aware libs?

Solution Folder
   >>Libraries
   >>Project 1
   >>Project 2

?