added math.randomBoolean

libs/microbit/helpers.ts

@@ -4,3 +4,14 @@ namespace console {
         serial.writeString("\r\n");
     }
 }
+
+namespace Math {
+    /**
+     * Generates a `true` or `false` value randomly, just like flipping a coin.
+     */
+    //% blockId=logic_random block="pick random true or false"
+    //% help=math/random-boolean color=210
+    export function randomBoolean(): boolean {
+        return Math.random(2) == 0;
+    }
+}