Add readme

Author: buttercookie42

README.md

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+# Disable Target API Block
+On Android 14, Google started blocking old apps (those targeting a target API lower than 23, i.e.
+anything before Marshmallow/Android 6) from being installed.
+
+While this behaviour can be overridden by calling `adb install` (respectively `pm install` if
+you've got access to a root shell on your device) with the `--bypass-low-target-sdk-block` flag, it
+still breaks simple manual installation of older APKs, as well as any backup apps and other software
+like that which hasn't yet been updated for this new behaviour.
+
+This Xposed module hooks the app installation process to always behave as if that flag had been
+passed and to therefore generally allow installation of old apps.
+
+## Compatibility
+Requires at least Android 14.