Add equality check operator

starfish.js

@@ -235,6 +235,12 @@ class CodeBox {
                 this.stack.push(y > x ? 1 : 0);
                 break;
             }
+            case "=": {
+                const x = this.stack.Pop();
+                const y = this.stack.Pop();
+                this.stack.push(y == x ? 1 : 0);
+                break;
+            }
             // Movement
             case "^":
                 this.MoveUp();