Migrate docs from the other repo

docs/lessons/spinner/activity.md

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+# spinner activity
+
+Create an arrow that randomly points to a player. 
+
+### ~avatar avatar
+
+### @video td/videos/spinner-0
+
+### ~
+
+Welcome! This guided tutorial will teach how to program a script that randomly points to a player. Let's get started!
+
+Let's begin by adding an `on shake` condition to know when the micro:bit is shaken.
+
+![](/static/mb/blocks/lessons/spinner-0.jpg)
+
+Now let's randomly generate a number from 0 to 3 so that we can randomly display an arrow in a given direction.
+
+![](/static/mb/blocks/lessons/spinner-1.jpg)
+
+Now let's handle each of the cases by displaying the appropriate arrow. (Let's display an up arrow if `random arrow` is 0.
+
+![](/static/mb/blocks/lessons/spinner-2.jpg)
+
+Now let's handle the rest of the cases for `random arrow`.
+
+![](/static/mb/blocks/lessons/spinner-3.jpg)
+
+### ~avatar avatar
+
+Excellent, you're ready to continue with the [challenges](/microbit/lessons/spinner/challenges)!
+
+### ~
+

docs/lessons/spinner/challenges.md

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+# spinner challenges
+
+Create an arrow that randomly points to a player.
+
+## Before we get started
+
+Complete the following [guided tutorial](/microbit/lessons/spinner/activity), your code should look like this:
+
+![](/static/mb/blocks/lessons/spinner-3.jpg)
+
+### Challenge 1
+
+Modify the random number generator so that it can include new arrows we will create in the next challenge.
+
+![](/static/mb/blocks/lessons/spinner-4.jpg)
+
+* Do **not** run the code yet because it will not work until you have conditions for every random number.
+
+### Challenge 2
+
+Let's add four more arrows that point diagonally.
+
+![](/static/mb/blocks/lessons/spinner-5.jpg)
+
+* Run your code to see if it works as expected
+
+### Challenge 3
+
+Add some other arrows if there are more than 8 players.
+