put lessons back for Michael

docs/lessons/love-meter/challenges.md

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+# love meter blocks challenges
+
+Create a love meter with the micro:bit  
+
+## Before we get started
+
+You should work on these challenges after the following the [love meter activity](/lessons/love-meter/activity)
+
+```blocks
+input.onPinPressed(TouchPin.P0, () => {
+    let x = Math.random(10)
+    basic.showNumber(x)
+})
+
+```
+
+### Challenge 1
+
+Add a pause of 3000 milliseconds (3 seconds) after showing the number so that the number won't immediately disappear in the next challenge.
+
+
+```blocks
+input.onPinPressed(TouchPin.P0, () => {
+    let x = Math.random(10)
+    basic.showNumber(x)
+    basic.pause(3000)
+})
+```
+
+### Challenge 2
+
+If the rating **x** is between *0* and *3* (strictly less than *4*), display the text "HORRIBLE!".
+
+
+```blocks
+input.onPinPressed(TouchPin.P0, () => {
+    let x = Math.random(10)
+    basic.showNumber(x)
+    basic.pause(3000)
+    if (x < 4) {
+        basic.showString("HORRIBLE")
+    }
+})
+```
+
+### Challenge 3
+
+**If** the rating is between 4 and 7, display the text "MEDIOCRE!" **else** display the text "MATCHED!"
+
+```blocks
+input.onPinPressed(TouchPin.P0, () => {
+    let x = Math.random(10)
+    basic.showNumber(x)
+    basic.pause(3000)
+    if (x < 4) {
+        basic.showString("HORRIBLE")
+    } else if (x < 8) {
+        basic.showString("MEDIOCRE")
+    } else {
+        basic.showString("MATCHED")
+    }
+
+})
+```
+
+### Challenge 4
+
+Use `show LEDs` to display images instead of text for each case.
+