Crane mission (#907)

* dummy page

* robot 1 lesson

* added lesson 2

* added mission 2

* added link

docs/tutorials/city-shaper/mission-2.md

@@ -0,0 +1,20 @@
+# Mission 2 Lesson
+
+Use the program below to tell your robot how to solve the Crane Mission (Mission 2).
+
+```blocks
+brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
+    motors.largeBC.steer(0, 25, 2.25, MoveUnit.Rotations)
+    control.timer1.reset()
+    while (control.timer1.seconds() < 1.5) {
+        motors.largeBC.steer(sensors.color1.light(LightIntensityMode.Reflected) - 40, 50)
+    }
+    motors.largeBC.stop()
+    motors.largeBC.steer(0, 15, 0.25, MoveUnit.Rotations)
+    motors.mediumA.run(25, 60, MoveUnit.Degrees)
+    pause(2000)
+    motors.mediumA.run(-25, 1, MoveUnit.Seconds)
+    motors.largeBC.steer(0, -100, 4, MoveUnit.Rotations)
+})
+motors.largeBC.setBrake(true)
+```