put lessons back for Michael

docs/lessons/beautiful-image/challenges.md

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+# beautiful image blocks challenges
+
+Coding challenges for the beautiful image tutorial. 
+
+## Before we get started
+
+Complete the [beautiful image](/lessons/beautiful-image/activity) activity and your code will look like this:
+
+```blocks
+basic.showLeds(`
+    # # # # #
+    # # . # #
+    # . # . #
+    # # . # #
+    # # # # #
+    `)
+```
+
+### Challenge 1
+
+Now show an new image that will display on the micro:bit.
+
+```blocks
+basic.showLeds(`
+    # # # # #
+    # # . # #
+    # . # . #
+    # # . # #
+    # # # # #
+    `)
+basic.showLeds(`
+    # . # . #
+    . # # # .
+    . . # . .
+    . # # # .
+    # . # . #
+    `)
+```
+
+* Does your code work as expected?
+
+### Challenge 2
+
+Nice job! Why don't we create a third image that will show after the other two?
+