Correct eDrive documentation about installation

Since app is now persistent we need to push the apk
instead of installing it through regular adb command.

README.md

@@ -7,7 +7,9 @@ It synchronizes user's data files to /e/Cloud or a self-hosted cloud.
 
 Since the application is persistent, you won't be able to reinstall
 the app with a regular `adb install -r` command. You will have to
-`pm uninstall foundation.e.drive` before reinstalling the application.
+allow root debugging in the Developer Options, then
+`adb root && adb remount`, then `adb push eDrive.apk /system/app/eDrive/eDrive.apk`
+and finally `adb reboot`.
 
 ## Map of synced directories