Update VisualStudio.gitignore

This will ignore SQL Server Reporting Services user files

VisualStudio.gitignore

@@ -4,6 +4,7 @@
 ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore
 
 # User-specific files
+*.rsuser
 *.suo
 *.user
 *.userosscache