Add simple FPS Counter (#18)

* FPS UI and Cube Physics fix

* Code improvement

Assets/Scenes/Playground.unity

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Assets/Scripts/CubeType.cs

@@ -7,4 +7,5 @@ public enum CubeTypes {
 
 public class CubeType : MonoBehaviour {
     public CubeTypes type;
+
 }

Assets/Scripts/UI/FpsUI.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+using TMPro;
+public class FpsUI : MonoBehaviour {
+    public TextMeshProUGUI fpsCounterText;
+    [SerializeField] private float fpsRefreshRate = 0.5f; // defines how often fps will be updated on HUD ;
+    private float fpsCounter;
+    private float timer;
+
+    void Update() {
+        if (Time.time > timer) {
+            fpsCounter = (int) (1f / Time.unscaledDeltaTime);
+            fpsCounterText.text = fpsCounter.ToString() + " FPS";
+            timer += fpsRefreshRate;
+        }
+    }
+}