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

mibe · mibe · commit 266c134a9efe · 2011-05-28T02:17:13.000+02:00
diff --git a/CSharp.gitignore b/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
