put lessons back for Michael

docs/lessons/strobe-light/activity.md

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+# strobe light activity
+
+Develop shapes with a for loop. 
+
+### ~avatar avatar
+
+
+
+Welcome! This guided tutorial will teach how to develop shapes with a for loop. Let's get started!
+
+### ~
+
+Create a `for loop` that will loop from 0 to 4 to indicate the x-coordinates of the micro:bit display.
+
+```blocks
+for (let i = 0; i < 5; i++) {
+    
+}
+
+```
+
+Create another for loop that will loop from 0 to 4, indicating the y-coordinates of the micro:bit instead. This for loop will light each LED by column.
+
+
+```blocks
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+
+    }
+}
+```
+
+
+We will light up each LED by plotting them individually.
+
+```blocks
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+        led.plot(i, j)
+        basic.pause(200)
+    }
+}
+```
+
+
+The pause will add a delay between lighting each LED.
+
+```blocks
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+        led.plot(i, j)
+        basic.pause(200)
+    }
+}
+```
+
+### ~avatar avatar
+
+Excellent, you're ready to continue with the [challenges](/lessons/strobe-light/challenges)!
+
+### ~
+