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.md

@@ -0,0 +1,13 @@
+# Brick
+
+## Screen
+
+```cards
+brick.showMood(moods.sleeping);
+brick.showImage(images.expressionsBigSmile);
+brick.showString("Hello world!", 1);
+brick.showNumber(0, 1);
+brick.showValue("item", 0, 1);
+brick.clearScreen();
+brick.printPorts();
+```