put lessons back for Michael

docs/lessons/temperature/activity.md

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+# temperature activity
+
+Measure the temperature on the micro:bit
+
+Welcome! This activity will teach how to measure the temperature on the micro:bit. Let's get started!
+
+We want to display the temperature on shake. In order to do so, we need to register the event `on shake` that will execute whenever the user shakes the micro:bit; in the web browser, click the button labelled "SHAKE" under the simulator to generate a shake event
+
+```blocks
+input.onGesture(Gesture.Shake, () => {
+    
+})
+```
+
+Let's measure the temperature and then store in it a variable `temp`. The temperature is measured in **Celsius**, so a value of `29` is equivalent to 29 degrees Celsius.
+
+
+```blocks
+input.onGesture(Gesture.Shake, () => {
+    let temp = input.temperature()
+})
+```
+
+Show the value of `temp` on the screen.
+
+```blocks
+input.onGesture(Gesture.Shake, () => {
+    let temp = input.temperature()
+    basic.showNumber(temp)
+})
+```
+
+* click run to see if the code works as expected.
+
+### ~avatar avatar
+
+Excellent, you're ready to continue with the [challenges](/lessons/temperature/challenges)!
+
+### ~
+