Improved readme

[ale5000-git]

Merged info for all Android versions to have a global idea Make it usable when the device is inside the recovery or inside the system Added separate adb commands for various Android versions Added info for Oreo Added Déjà Vu Location Service

(Based on pull request #146 by @David-Guillot)

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This change is 

[IzzySoft]

Looks like you have trouble with the "s". Shouldn't it read

Installing as system app will always works

And instead

I have kept "out of the box" because it means without changes …

? :wink:

[ale5000-git]

@IzzySoft: Fixed, see reply here.