README.md: add images

README.md

@@ -23,12 +23,24 @@ Everything is open source, so you can read, understand and modify the whole syst
 - compiler does its own Pascal dialect with some restrictions and some extensions
 - emulator available
 
-## Demo
+## Demos
+### Videos
 - (Video hello world)
 - (Video lines)
-- (Screenshot mandelbrot)
-- (Screenshot conway)
-- (Screenshot image viewer)
+
+### Still Pictures
+#### Mandelbrot
+![image](https://insignificance.de/tridora/tdr-mandelbrot.jpg)
+A simple program drawing the Mandelbrot set. This uses floating point and is quite slow (several minutes).
+
+#### Conway's Game of Life
+![image](https://insignificance.de/tridora/tdr-conway.jpg)
+Conway's game of life, with a limited size to make it not too slow.
+
+#### Image Viewer
+![image](https://insignificance.de/tridora/tdr-ara.jpg)
+Displaying a 640x400 pixel image in 16 colors on the VGA framebuffer. The framebuffer content
+stays when the display program terminates.
 
 ## Supported Boards
 - Arty A7 (with two PMODs for microSD cards and VGA output)