Start on the 'brick' api topics (#280)

* Start on the 'brick' api topics

* Add the delay to clear screen example

* Better output for clearsceen example

docs/reference/brick/show-value.md

@@ -0,0 +1,29 @@
+# show Value
+
+Show a name-value-pair on the screen at the line you select.
+
+```sig
+brick.showNumber("item", 0, 1);
+```
+
+Name-value-pairs are used to report data values to the screen. If you want to show the current temperature on the screen, you might use `"temp"` as the data name for the the value.
+
+## Parameters
+
+* **name**: a [string](/types/string) which is the name of the data value.
+**value**: a [number](/types/number) to show on the brick's screen.
+**line**: The line number on the screen where the value is displayed. The line numbers for the screen start with line `1`.
+
+## Example
+
+Show the current amount of ambient light detected by sensor 2.
+
+```blocks
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+    brick.showValue("color", sensors.color2.light(LightIntensityMode.Ambient), 1)
+})
+```
+
+## See also
+
+[show number](/reference/brick/show-number)