Updated the README

README.md

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+# Installing the bootloader
+Installing the MicroSD compatible bootloader is as easy as downloading the [Installer.apk](https://github.com/GarlicOS/bootloader_anbernic_rg405/releases/latest "Installer.apk"), installing it and running it on your **RG405**.
+### Uninstalling the bootloader
+Running the installer a second time will restore the original bootloader.
+
+# Creating bootable MicroSD cards
+To create a bootable MicroSD card:
+1. Format it with an **exfat** filesystem
+2. Create a **boot** folder on it
+3. Copy an OS **init** script of choice into the **boot** folder (ex. [GarlicOS](https://github.com/GarlicOS/init_template/raw/main/init "this one will do for GarlicOS"))
+4. Extract an OS **rootfs** file of choice into the **boot** folder with [7zip](https://www.7-zip.org/download.html "7zip") (ex. [GarlicOS](https://github.com/GarlicOS/buildroot/releases/latest "GarlicOS"))
+
+# Booting bootable MicroSD cards
+To boot a bootable MicroSD card:
+1. Make sure your device is powered off and **not plugged in**
+2. Hold down the **power button**
+3. 1.5 seconds into holding the power button, hold down the **home/back button** as well (you are now holding down two buttons)
+4. Let go of both buttons once the **Anbernic logo** is visible on screen