docs(readme): add module name question to route generator example

The route generator asks for a module name. Add it to match the usage experience.

Author: fahrradflucht

Diff for: readme.md

@@ -164,6 +164,7 @@ Generates a new route.
 Example:
 ```bash
 yo angular-fullstack:route myroute
+[?] What module name would you like to use? myApp
 [?] Where would you like to create this route? client/app/
 [?] What will the url of your route be? /myroute
 ```