put lessons back for Michael

docs/lessons/temperature/challenges.md

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+# temperature challenges
+
+Coding challenges for zoomer.
+
+## Before we get started
+
+Complete the following guided [temperature activity](/lessons/temperature/activity). At the end of the activity, your code should look like this:
+
+```blocks
+input.onGesture(Gesture.Shake, () => {
+    let temp = input.temperature()
+    basic.showNumber(temp)
+})
+```
+
+### Challenge 1
+
+Let's add the code to display the text `C IS THE TEMP` with a `show string` block. Modify the `show string` block to slowly display the text by an interval of `300`.
+
+```blocks
+input.onGesture(Gesture.Shake, () => {
+    let temp = input.temperature()
+    basic.showNumber(temp)
+    basic.showString("C IS THE TEMP")
+})
+```
+
+* Run the code to see if it works as expected.
+
+### Challenge 2
+
+Let's add code to display the temperature gauge image with a `show LEDs` block.
+