docs: update wiki command options

Author: clydin

docs/documentation/add.md

@@ -0,0 +1,9 @@
+<!-- Links in /docs/documentation should NOT have \`.md\` at the end, because they end up in our wiki at release. -->
+
+# ng add
+
+## Overview
+Add support for a library to your project.
+
+## Options
+None.