Added Outline Proxy (#3097)

README.md

@@ -1528,6 +1528,7 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
 - [iodine](https://code.kryo.se/iodine/) - IPv4 over DNS tunnel solution, enabling you to start up a socks5 proxy listener. ([Source Code](https://github.com/yarrick/iodine)) `ISC` `C`
 - [microproxy](https://github.com/thekvs/microproxy) - Lightweight non-caching HTTP/HTTPS proxy server. `MIT` `Go`
 - [Nginx Proxy Manager](https://nginxproxymanager.com/) - Nginx Proxy Manager is an easy way to accomplish reverse proxying hosts with SSL termination. ([Source Code](https://github.com/jc21/nginx-proxy-manager)) `MIT` `Nodejs/Docker`
+- [Outline Server](https://getoutline.org/) - A proxy server that runs a Shadowsocks instance for each access key and a REST API to manage the access keys. ([Source Code](https://github.com/Jigsaw-Code/outline-server)) `Apache-2.0` `Docker/Nodejs`
 - [PHP-Proxy](https://www.php-proxy.com/) - Web proxy script built specifically to be fast, easy to modify and to support video sites such as YouTube. ([Demo](https://unblockvideos.com/), [Source Code](https://github.com/Athlon1600/php-proxy-app)) `MIT` `PHP`
 - [Pomerium](https://pomerium.io) - An identity-aware reverse proxy, successor to now obsolete oauth_proxy. It inserts an OAuth step before proxying your request to the backend, so that you can safely expose your self-hosted websites to public Internet. ([Source Code](https://github.com/pomerium/pomerium)) `Apache-2.0` `Go`
 - [Pound](https://www.apsis.ch/pound.html) - Light-weight reverse proxy and load balancer for HTTP/HTTPS. `GPL-2.0` `C`