Added game state and network client

Assets/Scripts/GameState/GameStateController.cs

@@ -0,0 +1,31 @@
+using Unity.Netcode;
+using UnityEngine;
+
+namespace PashaBibko.PenguinChase.GameState
+{
+    public enum GameState
+    {
+        Lobby,
+        Playing,
+    }
+
+    public class GameStateController : NetworkBehaviour
+    {
+        private static GameStateController sInstance;
+        
+        [SerializeField] private NetworkVariable<GameState> GlobalState = new();
+
+        private void Awake()
+        {
+            // Stops overlapping instances
+            if (sInstance is not null)
+            {
+                Debug.LogError($"Multiple of [{nameof(GameStateController)}] cannot exist.");
+                Destroy(gameObject);
+                return;
+            }
+
+            sInstance = this;
+        }
+    }
+}