Egg and Spoon example (#429)

docs/examples.md

@@ -36,6 +36,11 @@ Here are some fun programs for your @boardname@!
 
 ```codecard
 [{
+  "name": "Egg & Spoon race",
+  "description": "Balance a micro:bit like an egg and spoon race",
+  "url":"/examples/egg-and-spoon",
+  "cardType": "example"
+},{
   "name": "Plot Acceleration",
   "description": "chart acceleration on the LED screen",
   "url":"/examples/plot-acceleration",

docs/examples/egg-and-spoon.md

@@ -0,0 +1,28 @@
+# Egg and Spoon race
+
+```blocks
+let accY = 0
+let accX = 0
+let y = 0
+let x = 0
+basic.forever(() => {
+    led.plot(x, y)
+    accX = input.acceleration(Dimension.X)
+    accY = input.acceleration(Dimension.Y)
+    if (accX < -150 && x > 0) {
+        x += -1
+    } else if (accX > 150 && x < 4) {
+        x += 1
+    }
+    if (accY < -150 && y > 0) {
+        y += -1
+    } else if (accY > 150 && y < 4) {
+        y += 1
+    }
+    basic.pause(500)
+    basic.clearScreen()
+})
+x = 2
+y = 2
+
+```