added gamescreen UI and simple start menu

Assets/Darkmatter/Code/Presentation/UI/GameScreenView.cs

@@ -0,0 +1,45 @@
+using System;
+using TMPro;
+using UnityEngine;
+using UnityEngine.SceneManagement;
+
+namespace Darkmatter.Presentation
+{
+    public class GameScreenView : MonoBehaviour
+    {
+        public TextMeshProUGUI fireableBulletText;
+        public TextMeshProUGUI remainingZombiesCountText;
+        public TextMeshProUGUI totalZombiesCountText;
+        public TextMeshProUGUI playerHealthText;
+        public GameObject GameOverObject;
+
+        public void UpdateBulletText(int bulletCount)
+        {
+            fireableBulletText.text = bulletCount.ToString();
+        }
+
+        public void UpdateRemainingZombiesCountText(int zombiesCount)
+        {
+            remainingZombiesCountText.text = zombiesCount.ToString();
+        }
+
+        public void UpdateTotalZombiesCount(int totalZombies)
+        {
+            totalZombiesCountText.text = totalZombies.ToString();   
+        }
+        public void ShowPlayerHealth(int health)
+        {
+            playerHealthText.text = health.ToString();
+        }
+       public void ShowGameOver()
+        {
+            GameOverObject.SetActive(true);
+            Invoke("ChangeScene", 2f);
+        }
+
+        void ChangeScene()
+        {
+            SceneManager.LoadScene(0);
+        }
+    }
+}