put lessons back for Michael

docs/lessons/strobe-light.md

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+# strobe light lesson
+
+Learn how to create a blinking LED script.
+
+
+
+## Topic
+
+For Loop
+
+## Quick links
+
+* [activity](/lessons/strobe-light/activity)
+* [challenges](/lessons/strobe-light/challenges)
+* [quiz](/lessons/strobe-light/quiz)
+* [quiz answers](/lessons/strobe-light/quiz-answers)
+
+## Documentation
+
+```cards
+led.plot(0, 0)
+led.unplot(0, 0)
+for (let i = 0; i < 5; i++) {}
+basic.pause(100)
+```
+
+## Objectives
+
+* learn how to repeat code a fixed number of times
+* learn how to turn on a LED light on the LED screen. Specify with LED using x, y coordinates
+* learn how to turn off a LED light on the LED screen. Specify which LED which x, y coordinates
+* learn how to pause program execution for the specified number of milliseconds