put lessons back for Michael

docs/lessons/snowflake-fall.md

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+# snowflake fall blocks lesson
+
+design a blinking rectangle animation.
+
+
+
+## Topic
+
+Forever
+
+## Quick Links
+
+* [activity](/lessons/snowflake-fall/activity)
+* [quiz](/lessons/snowflake-fall/quiz)
+* [quiz answers](/lessons/snowflake-fall/quiz-answers)
+* [challenges](/lessons/snowflake-fall/challenges)
+
+## Prior learning/place of lesson in scheme of work
+
+Learn how to show LEDs with a, `pause` to pause program execution for a specified amount of milliseconds. We will be learning how to show images using forever loop as well as simple commands, such as pause and show LEDs.
+
+## Documentation
+
+```cards
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . # . .
+    . . . . .
+    . . . . .
+    `)
+basic.pause(100)
+basic.forever(() => {})
+```