Update doc on demo mode

Author: TraGicCode

src/BuslyCLI.Console/Spectre/AppConfiguration.cs

@@ -49,7 +49,7 @@ public static Action<IConfigurator> GetSpectreCommandConfiguration()
             {
                 demo.SetDescription("Demo mode for the busly quick start guide.");
                 demo.AddCommand<StartDemoCommand>("start")
-                    .WithDescription("Start a demo endpoint that can receive a command and event.");
+                    .WithDescription("Start a demo endpoint that can receive any command and a single 'Messages.Events.OrderPlaced' event.");
             });
             config.PropagateExceptions();
         };

website/docs/cli-reference/demo/index.mdx

@@ -0,0 +1,7 @@
+import DocCardList from "@theme/DocCardList";
+
+# busly demo
+
+Use `busly demo` to start up an endpoint for testing busly through the quick start guide.
+
+<DocCardList />

website/docs/cli-reference/demo/start.md

@@ -0,0 +1,17 @@
+# busly demo start
+
+Start a demo endpoint that can receive any command and a single 'Messages.Events.OrderPlaced' event.
+
+## Usage
+
+```
+busly demo start
+```
+
+## Options
+
+## Examples
+
+```
+
+```