Added game state and network client

Assets/Scripts/Network/Authenticator.cs

@@ -0,0 +1,46 @@
+using PashaBibko.PenguinChase.Extensions;
+using Unity.Services.Authentication;
+using Unity.Services.Core;
+using System.Collections;
+using UnityEngine;
+
+namespace PashaBibko.PenguinChase.Network
+{
+    public static class Authenticator
+    {
+        public static bool IsAuthenticated { get; private set; }
+        private static bool sIsAuthenticating;
+
+        public static IEnumerator Authenticate()
+        {
+            // Early return if already authenticated
+            Debug.Log($"Authenticate called, [Authenticated: {IsAuthenticated}]");
+            if (IsAuthenticated)
+            {
+                yield break;
+            }
+
+            // Stops multiple authentication attempts at the same time
+            if (sIsAuthenticating)
+            {
+                yield return new WaitUntil(() => IsAuthenticated || !sIsAuthenticating);
+                yield break; // User should be logged in from other attempt
+            }
+            sIsAuthenticating = true;
+
+            Debug.Log("Initializing Unity Services");
+            yield return UnityServices
+                .InitializeAsync()
+                .Await();
+
+            Debug.Log("Signing in anonymously");
+            yield return AuthenticationService.Instance
+                .SignInAnonymouslyAsync()
+                .Await();
+
+            Debug.Log("User has been authenticated");
+            sIsAuthenticating = false;
+            IsAuthenticated = true;
+        }
+    }
+}