Add simple uart driver, more functionality etc etc etc

kernel/run.sh

@@ -0,0 +1,10 @@
+mkdir -p esp/EFI/BOOT
+cargo b --target x86_64-unknown-uefi --release
+cp target/x86_64-unknown-uefi/release/kernel.efi esp/EFI/BOOT/BOOTX64.EFI
+
+qemu-system-x86_64 \
+    -drive if=pflash,format=raw,readonly=on,file=/usr/share/edk2/x64/OVMF_CODE.4m.fd \
+    -drive if=pflash,format=raw,file=OVMF_VARS.4m.fd \
+    -drive format=raw,file=fat:rw:esp \
+    -net none \
+    -serial stdio