add configlet create (#486)

* configlet: document `create` command

* Add notes about using
'

* Add config entry

Author: ErikSchierboom

building/config.json

@@ -31,6 +31,12 @@
     "path": "building/configlet/lint.md",
     "title": "configlet lint"
   },
+  {
+    "uuid": "f7e00f6d-2a68-48d4-be84-d86fa43d677d",
+    "slug": "configlet/create",
+    "path": "building/configlet/create.md",
+    "title": "configlet create"
+  },
   {
     "uuid": "d8d9ff53-fe8f-4333-80c5-87517433cf7d",
     "slug": "configlet/generating-documents",