tree dc63b5e29c4356eeb4840fb062340ed537e53471
parent 8ccc653ef5add92b874664188e6333d5d486740f
author Lei YU <mine260309@gmail.com> 1577093600 +0800
committer Lei YU <mine260309@gmail.com> 1577416089 +0800

README: Add description about the usage of this repo

Add the description of several usage of this repo:
* How to generate a PSU image tarball;
* How to update the PSU image;
* How the version is updated when PSU is replaced.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I8727a27be138e03e6feecc26205f1c4b0adf8fbe