Add Armbian

Author: WebSnke

README.md

@@ -42,6 +42,7 @@ The complete collection of (consumer) Raspberry Pi models consist of:
 
 - [Alpine Linux](https://wiki.alpinelinux.org/wiki/Raspberry_Pi) - Security-oriented, lightweight Linux distribution based on musl libc and busybox.
 - [Arch Linux ARM](https://archlinuxarm.org/) - Lightweight and flexible Linux distribution that tries to Keep It Simple.
+- [Armbian](https://www.armbian.com/rpi4b/) - A base operating system platform for single board computers (SBCs) that other projects can trust to build upon.
 - [balenaOS](https://www.balena.io/os/) - open source OS to run Docker containers on embedded devices that's been designed for reliability and proven in production.
 - [BerryBoot](http://www.berryterminal.com/doku.php/berryboot) - Bootloader/universal OS installer, with support to VNC and HDMI-CEC.
 - [CentOS](https://wiki.centos.org/SpecialInterestGroup/AltArch/Arm32/RaspberryPi3) - CentOS on the Raspberry Pi. ![Supports Raspberry Pi 2+](/media/badges/rpi-2+.png)