README.md: experiments with open firmware for vacuum cleaner

WIP project: experiments with open firmware for
stm32f1xx-based e.ziclean cube vacuum cleaner.

Signed-off-by: Sergey Matyukevich <[email protected]>

Author: geomatsi

README.md

@@ -700,6 +700,7 @@ Work in progress crates. Help the authors make these crates awesome!
 
 ## Firmware projects
 - [anne-key](https://github.com/ah-/anne-key): Alternate keyboard firmware for the Obins ANNE Pro
+- [e.ziclean cube vacuum cleaner](https://github.com/geomatsi/e.ziclean-cube): Experiments with open firmware for e.ziclean cube vacuum cleaner
 
 ## License