[ADD] README.md

Author: KangOl

README.md

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+# 🧰 Upgrade Utils
+
+This repository contains helper functions to facilitate the writing of upgrade scripts.
+
+## Installation
+
+### The usual one
+Once you have clone this repository locally, just start `odoo` with the `src` directory prepended to the `--upgrade-path` option.
+```shell-session
+$ ./odoo-bin --upgrade-path=/path/to/upgrade-util/src,/path/to/other/upgrade/script/directory [...]
+```
+
+### The alternative one
+On platforms where you dont manage odoo yourself, i.e. [Odoo.sh](https://www.odoo.sh/), you can install this package via pip:
+```shell-session
+$ python3 -m pip install git+https://github.com/odoo/upgrade-util@master
+```
+
+## How to use them?
+Once installed, the following packages are available
+ - `odoo.upgrade.util`: the helper themself. See the wiki for info.
+ - `odoo.upgrade.testing`: base TestCase classes