Adding optional ignore proposal for wwwroot folder

There are use cases where you have gulp/grunt tasks that create the static files of a project from bower_components, images, scripts folders.

VisualStudio.gitignore

@@ -24,6 +24,8 @@ bld/
 
 # Visual Studio 2015 cache/options directory
 .vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
 
 # MSTest test Results
 [Tt]est[Rr]esult*/