title: Angular Schematics Prompt for array type
body: <p>When setting up my schematics I see that I can prompt for any of the following types String | Boolean | Array | Number | Integer | Null | Object.</p>
  
  <p>I am trying to set up a schematic that prompts the user to select a module from a list of available modules. So for example the user would see something like this:</p>
  
  <pre><code>What module are you adding this store to?
   &gt; Foo
     Bar
     Baz
  </code></pre>
  
  <p>While there are a ton of examples of both the String and Boolean prompts nobody has provided an example that I've found for the Array prompts. For the life of me I can not figure out how to provide the options in the array to prompt the user to select from and this doesn't appear in their documentation at all.</p>
  
  <pre><code>{
    "$schema": "http://json-schema.org/schema",
    "id": "SchematicsIDXStoreGen",
    "title": "IDX Store Gen Schema",
    "type": "object",
    "properties": {
      "featureName": {
        "type": "string",
        "description": "The name of the store",
        "x-prompt": "What is the name of the store you'd like to create"
      },
      "module": {
        "type": "array",
        "description": "Select the appropriate module",
        "x-prompt": "What module are you adding this store to?" // I want to provide a list of available modules here.
      }
    },
    "required": ["featureName", "module"]
  }
  </code></pre>