doc: added small README

README.md

@@ -1,9 +1,26 @@
+# Lanzaboote
 
+![GitHub branch checks state](https://img.shields.io/github/checks-status/blitz/lanzaboote/master)
+[![made-with-rust](https://img.shields.io/badge/Made%20with-Rust-1f425f.svg)](https://www.rust-lang.org/)
+[![GitHub license](https://img.shields.io/github/license/Naereen/StrapDown.js.svg)](https://github.com/Naereen/StrapDown.js/blob/master/LICENSE)
 
-# UEFI Helpers
+🚧🚧🚧 **This is not working yet. Come back later.*** 🚧🚧🚧
 
-How to boot a VM: https://rust-osdev.github.io/uefi-rs/HEAD/tutorial/vm.html
+This repository contains experimental tooling for Secure Boot on
+[NixOS](https://nixos.org/).
 
-```
-nix build  --builders "" && cp -f result/bin/lanzaboote.efi esp/EFI/Linux/lanzaboote.efi && qemu-uefi -drive format=raw,file=fat:rw:esp
-```
+## lanzatool
+
+`lanzatool` is a Linux command line application that takes a
+[bootspec](https://github.com/NixOS/rfcs/pull/125) document and
+installs the boot files into the UEFI
+[ESP](https://en.wikipedia.org/wiki/EFI_system_partition).
+
+## lanzaboote
+
+`lanzaboote` is a UEFI application that is started by systemd-boot (or
+any other EFI boot loader) and loads a Linux kernel and initrd without
+breaking the Secure Boot chain of trust.
+
+The information what kernel with what command line and initrd to boot
+is embedded into the `lanzaboote` by `lanzatool`.