add readme

README.md

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+# UEFI Conway's Game of Life
+
+Conway's GOL in uefi-rs.
+
+## Run in QEMU
+
+Install the firmware files:
+
+Nix:
+
+```
+nix build nixpkgs#OVMF
+```
+
+Debian/Ubuntu:
+
+```
+sudo apt-get install qemu ovmf
+```
+
+Fedora:
+
+```
+sudo dnf install qemu-kvm edk2-ovmf
+```
+
+Then copy the firmware files to the project directory.
+
+Then run
+
+```
+./run.sh
+```