Add gd image library to readme

installed through etc:
`apt install php-gd` or `apt install php7.4-gd`
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Stefan A. Brannfjell 2022-02-23 12:34:49 +01:00 committed by GitHub
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@ -20,6 +20,7 @@ We use github to distribute our versions, stable are tagged as releases, while d
* For email registration verification and account recovery: [PHPMailer](https://github.com/PHPMailer/PHPMailer/releases) Version 6.x, extracted and renamed to just "PHPMailer" in Znote AAC directory.
* PHP extension curl for PHPMailer, paypal and google reCaptcha services.
* PHP extension openssl for google reCaptcha services.
* PHP extension gd for guild logos.
### Installation instructions