ReSharper is a add-in which works in Visual Studio only. It's already in the VisualStudio gitignore file.

CSharp.gitignore

@@ -1,6 +1,3 @@
-# ReSharper meta directory
-_ReSharper*
-
 # Build Folders (you can keep bin if you'd like, to store dlls and pdbs)
 bin
 obj