Update README

Author: cytopia

README.md

@@ -11,6 +11,8 @@
 
 **[devilbox/docker-nginx-mainline](https://github.com/devilbox/docker-nginx-mainline)**
 
+**Available Architectures:**  `amd64`, `arm64`, `386`, `arm/v7`, `arm/v6`
+
 This image is based on the official **[Nginx](https://hub.docker.com/_/nginx)** Docker image and extends it with the ability to have **virtual hosts created automatically**, as well as **adding SSL certificates** when creating new directories. For that to work, it integrates two tools that will take care about the whole process: **[watcherd](https://github.com/devilbox/watcherd)** and **[vhost-gen](https://github.com/devilbox/vhost-gen)**.
 
 From a users perspective, you mount your local project directory into the container under `/shared/httpd`. Any directory then created in your local project directory wil spawn a new virtual host by the same name. Additional settings such as custom server names, PHP-FPM or even different Apache templates per project are supported as well.