Updated docs a bit

docs/samples/command_service_creation.cs

@@ -0,0 +1,9 @@
+//create command service
+var commandService = new CommandService(new CommandServiceConfig
+{
+    CommandChar = '~', // prefix char for commands
+    HelpMode = HelpMode.Public
+});
+
+//add command service
+var commands = client.AddService(commandService);