feat: implement basic server functionality

Adds a new Server class to manage multiplayer sessions. The server 
automatically starts in a server build, initializes the NetworkManager, 
and loads the specified multiplayer scene after a delay. It also logs 
client connections and handles cleanup on application quit. This 
enhances the networking capabilities of the application.

Assets/Scripts/Runtime/Networking/Server.cs

@@ -0,0 +1,81 @@
+using Unity.Netcode;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+using System;
+using System.Collections;
+
+public class Server : MonoBehaviour
+{
+    [SerializeField] private string multiplayerSceneName = "MultiplayerScene"; // Name of the scene to load
+
+    void Start()
+    {
+        // Start the server automatically in a server build
+        if (IsServerBuild())
+        {
+            StartServer();
+        }
+    }
+
+    void StartServer()
+    {
+        // Ensure NetworkManager is initialized
+        if (NetworkManager.Singleton == null)
+        {
+            Log("NetworkManager is not initialized. Cannot start server.");
+            return;
+        }
+
+        // Subscribe to the client connected event
+        NetworkManager.Singleton.OnClientConnectedCallback += OnClientConnected;
+
+        // Start the server
+        NetworkManager.Singleton.StartServer();
+        Log("Server started!");
+
+        // Start the coroutine to load the MultiplayerScene after 3 seconds
+        StartCoroutine(LoadMultiplayerSceneAfterDelay(3));
+    }
+
+    IEnumerator LoadMultiplayerSceneAfterDelay(float delay)
+    {
+        Log($"Waiting for {delay} seconds before loading the MultiplayerScene...");
+        yield return new WaitForSeconds(delay); // Wait for the specified delay
+
+        // Load the MultiplayerScene
+        Log($"Loading scene: {multiplayerSceneName}");
+        NetworkManager.Singleton.SceneManager.LoadScene(multiplayerSceneName, LoadSceneMode.Single);
+    }
+
+    void OnClientConnected(ulong clientId)
+    {
+        string message = $"Player with Client ID {clientId} connected.";
+        Log(message);
+    }
+
+    void OnApplicationQuit()
+    {
+        // Unsubscribe from the event to avoid memory leaks
+        if (NetworkManager.Singleton != null)
+        {
+            NetworkManager.Singleton.OnClientConnectedCallback -= OnClientConnected;
+        }
+        Log("Server is quitting...");
+    }
+
+    bool IsServerBuild()
+    {
+#if UNITY_SERVER
+        return true;
+#else
+        return false;
+#endif
+    }
+
+    // Log to terminal
+    void Log(string message)
+    {
+        string logMessage = $"{DateTime.Now}: {message}";
+        Console.WriteLine(logMessage); // Log to terminal
+    }
+}

Assets/Scripts/Runtime/Networking/Server.cs.meta

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+fileFormatVersion: 2
+guid: 881cf6d09045dad41ba8aabe5172101d