Merge branch '6652-add-vs-ide-support-to-gitignore' into 'develop'

Adds support for VS IDE to gitignore file

Closes #6652

See merge request ispconfig/ispconfig3!1856

Author: Till Brehm

.gitignore

@@ -50,4 +50,7 @@ Temporary Items
 
 # Visual Studio code coverage results
 *.coverage
-*.coveragexml
+*.coveragexml
+
+# Visual Studio IDE cache/options directory
+.vs/