fire: Add install instructions

12/fire.md

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+### Pre-installation:
+
+* Unlocked bootloader.
+* Latest Android 14 firmware for Redmi 12 / POCO M6 Pro 4G (fire).
+* crDroid recovery from the download page or extracted from the ROM package.
+* Optional GApps package from the download page if you want Google apps.
+* ADB and fastboot installed on your computer.
+
+### First time installation (clean flash):
+
+* Boot the device to bootloader mode.
+
+```
+adb reboot bootloader
+```
+
+* Flash crDroid recovery.
+
+```
+fastboot flash vendor_boot vendor_boot.img
+fastboot reboot recovery
+```
+
+* In recovery, choose **Factory reset** > **Format data/factory reset** and confirm.
+* Return to the main menu and choose **Apply update** > **Apply from ADB**.
+* Sideload the crDroid package.
+
+```
+adb sideload crdroid.zip
+```
+
+* If you want GApps, reboot back to recovery, choose **Apply update** > **Apply from ADB**, then sideload the GApps package.
+
+```
+adb sideload gapps.zip
+```
+
+* Reboot to system.
+
+### Update installation:
+
+* Use the built-in updater from **Settings** > **System** > **Updater**, or boot to recovery and sideload the new crDroid package.
+
+```
+adb sideload crdroid.zip
+```
+
+* If you use GApps and recovery asks you to reflash them after the ROM update, reboot back to recovery and sideload the same or newer GApps package before booting system.