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-image.md

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+# show Image
+
+Show an image on the brick's display.
+
+```sig
+brick.showImage(images.expressionsBigSmile);
+```
+You can choose one of several images to show on the display. 
+
+## Parameters
+
+**image**: A image to show on the brick's display. Use the image picker to choose the image you want to show.
+
+## Example
+
+Show a sleeping image on the brick's display.
+
+```blocks
+brick.showImage(image.expressionsZzz)
+```
+
+## See also
+
+[show image](/reference/brick/show-mood)