Merge airmouse from https://github.com/ginkage/FlippAirMouse/

airmouse/README.md

@@ -1,3 +1,6 @@
+[!["Buy Me A Coffee"](https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png)](https://www.buymeacoffee.com/ginkage)
+[![paypal](https://www.paypalobjects.com/en_GB/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=LF9S5WAF6E4VA)
+
 # Flipper Air Mouse
 
 ## Brief