Add file extensions from MSVS to gitignore file

Change-Id: Icb976111a3442eff2cd3ba0b015eef7067fe7006
Reviewed-on: https://gerrit.libreoffice.org/7582Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

.gitignore

@@ -87,3 +87,11 @@ build
 project.xcworkspace
 xcuserdata
 *.xuserstate
+
+# MSVS specific
+*/Debug
+*.sdf
+*.sln
+*.v11*
+*.vcxproj*
+*.opensdf