Implement dialogue system

Assets/Scripts/Utilities/WaitForKeyDown.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+
+namespace Scampz.GameJam.Assets.Scripts.Utilities
+{
+  public class WaitForKeyDown : CustomYieldInstruction
+  {
+    private List<string> _inputOptions;
+
+    public override bool keepWaiting => !ShouldContinue();
+
+    public WaitForKeyDown(params string[] inputOptions)
+    {
+      _inputOptions = inputOptions.ToList();
+    }
+
+    private bool ShouldContinue()
+    {
+      foreach (var input in _inputOptions)
+      {
+        if (Input.GetButtonDown(input))
+          return true;
+      }
+
+      return false;
+    }
+  }
+}