Add a new link

Author: cheatsnake

README.md

@@ -1957,7 +1957,7 @@ Look for a special [awesome repository](https://github.com/sindresorhus/awesome#
 
 [API (Application Programming Interface)](https://en.wikipedia.org/wiki/API) an interface which describes a certain set of rules by which different programs (applications, bots, websites...) can interact with each other. With API calls you can execute certain functions of a program without knowing how it works.
 
-When developing server applications, different API formats can be used, depending on the tasks and requirements.
+When developing server applications, [different API formats](https://youtu.be/4vLxWqE94l4) can be used, depending on the tasks and requirements.
 
 - ### REST API