Update snake.html

Author: jrobbins

snake.html

@@ -28,6 +28,9 @@
 <p>Keys: w, a, s, d.</p>
 
     <script>
+      // Most of this code is inspired by this excellent FORTH tutorial.
+      // https://skilldrick.github.io/easyforth/
+      
  // Create the HTML elmements, these never change, only their CSS class changes.
 let sectionEl = document.querySelector("section");
 for (let i=0; i<24*24; i++) {