Merge pull request #1503 from LunicLynx/keep-cache-directories

add rule to keep track of directories ending in .Cache

VisualStudio.gitignore

@@ -154,8 +154,13 @@ csx/
 # Windows Store app package directory
 AppPackages/
 
-# Others
+# Visual Studio cache files
+# files ending in .cache can be ignored
 *.[Cc]ache
+# but keep track of directories ending in .cache
+!*.[Cc]ache/
+
+# Others
 ClientBin/
 [Ss]tyle[Cc]op.*
 ~$*