README.md in vandal_ui-0.3.3 vs README.md in vandal_ui-0.4.0

@@ -1,22 +1,44 @@
-# Vandal
+# Vandal UI
+
+This is a Rails engine for
+[Graphiti](https://graphiti-api.github.io/graphiti/guides/) APIs. It has
+two main functions:
+
+* `rake vandal:install` will copy static files to `public/<api_namespace>`.
+* Mounting the engine adds an endpoint for a dynamically-generated
+  schema file:
+
+```ruby
+# config/routes.rb
+
+scope path: ApplicationResource.endpoint_namespace, defaults: { format: :jsonapi } do
+  # ... routes ...
+
+  mount VandalUi::Engine, at: '/vandal'
+end
+```
+
+If `ApplicationRecord.endpoint_namespace` is `/api/v1`, you'd get a
+`/api/v1/vandal/schema.json` that would be referenced when loading the
+UI.