Initial framework for upgrade shop

Assets/UI overlay/WaveIndicator.cs

@@ -0,0 +1,17 @@
+using UnityEngine;
+
+public class WaveIndicator : MonoBehaviour
+{
+	GameState gameState;
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        gameState = GameObject.FindGameObjectWithTag("GameController").GetComponent<GameState>();
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+		GetComponent<TMPro.TMP_Text>().text = "Wave: "+gameState.wave;
+    }
+}