Preferable way is to use Composer:
```
composer require innocode-digital/wp-normalize
```
By default, it will be installed as Must Use Plugin. It's possible to change with extra.installer-paths in composer.json.

Alternate way is to clone this repo to wp-content/mu-plugins/ or wp-content/plugins/:

cd wp-content/plugins/
git clone git@github.com:innocode-digital/wp-normalize.git
cd wp-normalize/
composer install

If plugin installed as regular plugin then activate Normalize from Plugins page or WP-CLI: wp plugin activate wp-normalize.