Add a README

Author: A6GibKm

README.md

@@ -0,0 +1,10 @@
+# Arduino IDE Flatpak
+
+Flatpak build of [Arduino IDE](https://github.com/arduino/Arduino). To run the
+app you need USB permissions, preferably, the user has to be part of the
+`dialout` group. Alternatively, add 
+``` sh
+KERNEL=="ttyUSB[0-9]*",MODE="0666"
+KERNEL=="ttyACM[0-9]*",MODE="0666"
+```
+to `/etc/udev/rules.d/50-arduino.rules`.