Update README.md

Author: jslvtr

README.md

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 This repository contains code that is created in my course, REST APIs with Flask and Python.
 
+You can take the course here: [https://go.tecla.do/rest-apis-sale](https://go.tecla.do/rest-apis-sale)
+
 The code is divided in folders, one for each section of the course which contains code.
 
 ## Section 2