Update README.md

Author: tshemsedinov

README.md

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 ## Thenable contract
 
+[👉 Оглавление курса Async 2024](https://github.com/HowProgrammingWorks/Index/blob/master/Courses/Async-2024.md)
+
 [![Thenable и легковесный await в JavaScript](https://img.youtube.com/vi/DXp__1VNIvI/0.jpg)](https://www.youtube.com/watch?v=DXp__1VNIvI)