put lessons back for Michael

docs/lessons/counter.md

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+# counter lesson
+
+Learn how to create a counter with with on button pressed.
+
+## Topic
+
+Variables
+
+## Quick Links
+
+* [activity](/lessons/counter/activity)
+* [challenges](/lessons/counter/challenges)
+* [quiz](/lessons/counter/quiz)
+* [quiz answers](/lessons/counter/quiz-answers)
+
+## Prior learning/place of lesson in scheme of work
+
+Learn how to creating a **variable** to keep track of the current count. We will be learning how to create a counter app using a variable as well as simple commands, such as on button pressed, and show number.
+
+## Documentation
+
+```cards
+input.compassHeading()
+basic.forever(() => {})
+let x = 0
+if (true) {}
+basic.showString("Hello!")
+basic.showLeds(`
+    . . . . .
+    . . . . .
+    . . # . .
+    . . . . .
+    . . . . .
+    `)
+```
+
+* **variable**: [read more...](/reference/variables/var)
+* **arithmetic operators**: [read more...](/reference/types/number)
+* **on button pressed** : [read more...](/reference/input/on-button-pressed)
+* **show number** : [read more...](/reference/basic/show-number)
+
+## Objectives
+
+* learn how to create a variable as a place where you can store data so that you can use it later in your code, accessible across all functions, and in nested code blocks
+* learn how arithmetic operators operate on numbers and return a number
+* learn how to run code when an input button is pressed
+* learn how to show a number on the LED screen, one digit at a time (scrolling from left to right)
+