Add script to build and flash pmos build

.gitignore

@@ -1,2 +1,3 @@
 /firmware-magisk/
 /thor/
+/flashing/

README.md

@@ -14,3 +14,6 @@ Enable OEM Unlocking in Android Developer Options, Enter Download Mode, Hold Vol
 ```bash
 pmbootstrap install --no-recommends --android-recovery-zip --password pw --zap --recovery-install-partition super
 ```
+
+## Misc. Links
+- https://softhandtech.com/what-is-ffbm-mode-in-android/

scripts/build-and-flash.sh

@@ -0,0 +1,4 @@
+#!/usr/bin/env -S bash -xe
+pmbootstrap install --no-recommends --password pw --zap
+pmbootstrap flasher --no-reboot flash_kernel
+pmbootstrap flasher --resume flash_vbmeta