put lessons back for Michael

docs/lessons/compass/challenges.md

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+# compass challenges
+
+Display the direction that the micro:bit is facing using the compass 
+
+## Before we get started
+
+Complete the following [guided tutorial](/lessons/compass/activity), your code should look like this:
+
+```blocks
+ let degrees = 0;
+basic.forever(() => {
+    degrees = input.compassHeading();
+    if (degrees < 45) {
+        basic.showString("N");
+    }
+    else if (degrees < 135) {
+        basic.showString("E");
+    }
+    else if (degrees < 225) {
+        basic.showString("S");
+    }
+    else {
+        basic.showString("W");
+    }
+});
+```
+
+### Challenge 1
+
+Instead of displaying `N` when the BBC micro:bit is pointing North, display a star to indicate the north star.
+
+```blocks
+ let degrees = 0;
+basic.forever(() => {
+    degrees = input.compassHeading();
+    if (degrees < 45) {
+        basic.showLeds(`
+# . # . #
+. # # # .
+# # # # #
+. # # # .
+# . # . #`);
+    }
+    else if (degrees < 135) {
+        basic.showString("E");
+    }
+    else if (degrees < 225) {
+        basic.showString("S");
+    }
+    else {
+        basic.showString("W");
+    }
+});
+```
+
+
+* Run your code to see if it works as expected
+
+### Challenge 2
+
+Instead of displaying just `N`, `W`, `S`, or `E`, display the full word.
+
+```blocks
+ let degrees = 0;
+basic.forever(() => {
+    degrees = input.compassHeading();
+    if (degrees < 45) {
+        basic.showString("NORTH");
+    }
+    else if (degrees < 135) {
+        basic.showString("EAST");
+    }
+    else if (degrees < 225) {
+        basic.showString("SOUTH");
+    }
+    else {
+        basic.showString("WEST");
+    }
+});
+```
+
+
+* Run your code to see if it works as expected
+
+### Challenge 3
+
+Display your own unique message for each direction.
+