Merge pull request #1451 from eriawan/update_gitignore_to_ignore-VS_localized_files

update gitignore to ignore VS local machine (localized) files

Author: gewarren

.gitignore

@@ -9,3 +9,15 @@ _themes.MSDN.Modern/
 _themes.VS.Modern/
 
 .openpublishing.buildcore.ps1
+
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs