Added proxy description

README.md

@@ -1619,6 +1619,8 @@ _Related: [Booking and Scheduling](#booking-and-scheduling)_
 
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+A [proxy](https://en.wikipedia.org/wiki/Proxy_server) is a server application that acts as an intermediary between a client requesting a resource and the server providing that resource.
+
 - [imgproxy](https://imgproxy.net/) - Fast and secure standalone server for resizing and converting remote images. It works great when you need to resize multiple images on the fly without preparing a ton of cached resized images or re-doing it every time the design changes. ([Source Code](https://github.com/imgproxy/imgproxy)) `MIT` `Go/Docker`
 - [inlets](https://inlets.dev/) - Expose your local endpoints to the Internet - with a Kubernetes integration, Docker image and CLI available. `MIT` `Go/Docker`
 - [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`