Migrate docs from the other repo

docs/reference/js/guides/light-column-cascade.md

@@ -0,0 +1,43 @@
+# Light Column Cascade Activity
+
+My script. #docs
+
+**Challenge 0**
+
+Great Job! You have completed the Light Column Cascade tutorial having a nested for loop that plots each individual LED by column adding a delay between lighting each LED.
+
+```
+for (let i = 0; i < 5; i++) {
+    for (let j = 0; j < 5; j++) {
+        led.plot(i, j)
+        basic.pause(200)
+    }
+}
+```
+
+**Challenge 1**
+
+Make the board light up faster by making the pause less time.
+
+```
+for (let i1 = 0; i1 < 5; i1++) {
+    for (let j1 = 0; j1 < 5; j1++) {
+        led1.plot(i1, j1)
+        basic1.pause(100) // ***
+    }
+}
+```
+
+**Challenge 2**
+
+Make the board light up by rows instead of by columns by changing the i to the y position and j to the x position.
+
+```
+for (let i2 = 0; i2 < 5; i2++) {
+    for (let j2 = 0; j2 < 5; j2++) {
+        led2.plot(j2, i2) // ***
+        basic2.pause(100)
+    }
+}
+```
+