Update README.md

README.md

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 Firewall Linux - A small and simple Linux Firewall Distribution
 
+## Target platforms
+
+- QEMU/KVM
+- [PCEngines APU2](https://www.pcengines.ch/apu2.htm)
+
+## Design
+
+### Partitioning
+
+MBR/BIOS:
+
+```
+/dev/disk:
+  /dev/disk1 - ext2  - /boot
+  /dev/disk2 - swap
+  /dev/disk3 - btrfs - /
+```
+
+Subvolumes:
+
+  - 2021-04-01: Released version
+  - latest: Newest version used for next boot
+  - current: Currently active version in case next boot fails
+
 ---
 
 Made with ❤️ and 🪄✨.