Document requirements.

Author: CyrilBrulebois

README.md

@@ -26,3 +26,11 @@ It operates by turning pristine
 [Debian-provided images for Raspberry Pi](https://raspi.debian.net/) into
 images ready to deploy PiRogue Tool Suite packages. In the future the same might
 happen for [Debian-provided cloud images](https://cloud.debian.org/images/cloud/).
+
+Package requirements:
+
+ - fdisk
+ - kpartx
+ - qemu-system-arm
+ - qemu-user-static
+ - zerofree