put lessons back for Michael

docs/lessons/smiley/challenges.md

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+# smiley blocks challenges
+
+Coding challenges for the smiley. 
+
+## Before we get started
+
+Complete the [smiley activity](/lessons/smiley/activity) and your code will look like this:
+
+
+```blocks
+basic.showLeds(`
+    . # . # .
+    . # . # .
+    . . . . .
+    # . . . #
+    . # # # .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+```
+
+
+### Challenge 1
+
+What if we want to make the face to frown on button pressed A?
+
+Let's make add code that will run when button A is pressed!
+
+
+```blocks
+basic.showLeds(`
+    . # . # .
+    . # . # .
+    . . . . .
+    # . . . #
+    . # # # .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+input.onButtonPressed(Button.A, () => {
+    
+})
+```
+
+### Challenge 2
+
+
+
+Now, we want to show a frowny face when this button is pressed. Let's show the LEDs.
+
+```blocks
+basic.showLeds(`
+    . # . # .
+    . # . # .
+    . . . . .
+    # . . . #
+    . # # # .
+    `)
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . . . .
+    . . . . .
+    . . . . .
+    `)
+input.onButtonPressed(Button.A, () => {
+    basic.showLeds(`
+        . # . # .
+        . # . # .
+        . . . . .
+        . # # # .
+        # . . . #
+        `)
+})
+
+```
+
+* Run your code to see if it works as expected.
+
+### Challenge 3
+
+When *button B* is pressed, let's change the sad face back to a happy face. To do this, begin by adding a condition for `on button pressed` *B*. Next, show LEDs as a smiley face inside the condition.
+