Add *.userosscache to Visual Studio .gitignore

I haven't found good documentation for this file online, but it is a user based file that should be ignored.

VisualStudio.gitignore

@@ -4,6 +4,7 @@
 # User-specific files
 *.suo
 *.user
+*.userosscache
 *.sln.docstates
 
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