docs(generator): add docs help in usage #1411 (#1446)

Author: ramonornela

lib/ionic/generate.js

@@ -16,7 +16,21 @@ var settings = {
     '--list': {
       title: 'List available generators',
       boolean: true
-    }
+    },
+    '--includeSpec': {
+      title: 'Create test spec basic to pages, components, directives, pipes and providers',
+      boolean: true
+    },
+    '--skipScss': {
+      title: 'Not create scss for components and pages',
+      boolean: true
+    },
+    '--componentsDir': 'Path directory target is created component',
+    '--directivesDir': 'Path directory target is created directive',
+    '--pagesDir': 'Path directory target is created page',
+    '--pipesDir': 'Path directory target is created pipe',
+    '--providersDir': 'Path directory target is created provider',
+    '--templateDir': 'Path directory templates custom to pages, components, directives, pipes and providers'
   },
   isProjectTask: true
 };