Added example program

README.md

@@ -26,3 +26,12 @@ If the flash fails, try to add `--slow` before the `--port` argument (should not
 
 The tool also allows reading and erasing the chip, figure that out on your own if you need that (although `tulflash --help` might guide you if you ask it nicely).
 
+## Example program
+
+You'll need to clone this repo (or just [download the file](example.c)) and install SDCC:
+
+```
+sdcc example.c
+tulflash --port ... write example.ihx
+```
+