add favicon

index.php

@@ -9,6 +9,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link href="https://fonts.googleapis.com/css2?family=Patrick+Hand&display=swap" rel="stylesheet">
+  <link rel="icon" type="image/x-icon" href="icon.png">
   <script>
     window.onload = function () {
       var context = new AudioContext();