Migrate docs from the other repo

docs/lessons/rotation-animation/challenges.md

@@ -0,0 +1,146 @@
+# rotation animation block challenges
+
+Coding challenges for the rotation animation.
+
+## Before we get started
+
+Complete the following guided activity:
+
+* [activity](/microbit/lessons/rotation-animation/activity)
+
+At the end of the activity, your code should look like this:
+
+
+```blocks
+let rotating = true;
+while (rotating) {
+    basic.pause(20)
+    basic.showLeds(`
+        # . . . .
+        . # . . .
+        . . # . .
+        . . . # .
+        . . . . #
+        `)
+    basic.showLeds(`
+        . . # . .
+        . . # . .
+        . . # . .
+        . . # . .
+        . . # . .
+        `)
+    basic.showLeds(`
+        . . . . #
+        . . . # .
+        . . # . .
+        . # . . .
+        # . . . .
+        `)
+    basic.showLeds(`
+        . . . . .
+        . . . . .
+        # # # # #
+        . . . . .
+        . . . . .
+        `)
+}
+```
+
+
+### Challenge 1
+
+Now let's add to this by creating a condition for on button pressed `A` before the while loop.
+
+```blocks
+
+let rotating = true;
+while (rotating) {
+    basic.pause(20)
+    basic.showLeds(`
+        # . . . .
+        . # . . .
+        . . # . .
+        . . . # .
+        . . . . #
+        `)
+    basic.showLeds(`
+        . . # . .
+        . . # . .
+        . . # . .
+        . . # . .
+        . . # . .
+        `)
+    basic.showLeds(`
+        . . . . #
+        . . . # .
+        . . # . .
+        . # . . .
+        # . . . .
+        `)
+    basic.showLeds(`
+        . . . . .
+        . . . . .
+        # # # # #
+        . . . . .
+        . . . . .
+        `)
+}
+input.onButtonPressed(Button.A, () => {
+    
+})
+
+
+```
+
+### Challenge 2
+
+### @video td/videos/rotation-animation-1-and-2
+
+Now that we have the on button pressed condition, let's make the animation stop rotating by setting the rotating global variable to false when button `A` is pressed.
+
+```blocks
+let rotating = true;
+while (rotating) {
+    basic.pause(20)
+    basic.showLeds(`
+        # . . . .
+        . # . . .
+        . . # . .
+        . . . # .
+        . . . . #
+        `)
+    basic.showLeds(`
+        . . # . .
+        . . # . .
+        . . # . .
+        . . # . .
+        . . # . .
+        `)
+    basic.showLeds(`
+        . . . . #
+        . . . # .
+        . . # . .
+        . # . . .
+        # . . . .
+        `)
+    basic.showLeds(`
+        . . . . .
+        . . . . .
+        # # # # #
+        . . . . .
+        . . . . .
+        `)
+}
+input.onButtonPressed(Button.A, () => {
+    let rotating = false; 
+})
+
+
+```
+
+* Run the code to see the awesome rotation.
+
+### Challenge 3
+
+Let's also make the image rotate the opposite way when button A is pressed! We can do this with another while loop that is only executed while `not rotating`.
+