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-string.md

@@ -0,0 +1,27 @@
+# show String
+
+Show some text on a the screen at the line you select.
+
+```sig
+brick.showString("Hello world", 1)
+```
+
+## Parameters
+
+* **text**: a [string](/types/string) to show on the brick's screen.
+* **line**: the line [number](/types/number) on the screen where the text is displayed. The line numbers for the screen start with line `1`.
+
+## Example
+
+Show a greeting on the screen. Then, respond with another message when ENTER is pressed.
+
+```blocks
+brick.showString("Hello, I dare you to press ENTER...", 1);
+brick.buttonEnter.onEvent(ButtonEvent.Click, function () {
+	brick.showString("Hey! Don't push my buttons.", 3);
+});
+```
+
+## See also
+
+[show number](/reference/brick/show-number)