GP-65 add a link to exercise overview video

Author: tboychuk

1-0-networking-and-http/1-0-0-hello-network-socket/README.MD

@@ -16,7 +16,7 @@ Learn **Sockets** – the essential part of Java networking 💪
 * **experiment** with MessageBoard application that consists of a client and server apps ✅
 
 ### Exercise overview 🇺🇦
-TDB
+[Network Socket – Основа Основ. Огляд Нової Вправи "hello-network-socket"](https://youtu.be/31u5CoVDX5w) <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/yt_icon_rgb.png" height=13/>
 
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