docs(integration): record SpaceGame pilot checkpoint (#21)

src/FinalFactory.Rendezvous.Client/README.md

@@ -67,12 +67,17 @@ factory does not open a socket, and synchronized events must remain enabled:
 ```csharp
 RendezvousNetListener networkEvents = new();
 NetManager gameplayNetManager = networkEvents.CreateManager();
+gameplayNetManager.ChannelsCount = 3; // example: configure the game protocol first
 if (!gameplayNetManager.Start(0))
 {
     throw new InvalidOperationException("The gameplay UDP socket could not start.");
 }
 ```
 
+LiteNetLib defaults to one QoS channel. Set `ChannelsCount` before `Start` when
+the game protocol uses more than one; both game processes must agree. Rendezvous
+does not reserve or reinterpret any gameplay channel.
+
 The host polls join invitations asynchronously; that method only queues a
 snapshot and never calls the manager. `Poll()` is the sole SDK path that invokes
 LiteNetLib and dispatches its synchronized callbacks. Call it once per game