docs: updated readme

Author: Luis Valgoi

packages/ui5-webcomponents-react-seed/README.md

@@ -74,6 +74,12 @@ Builds the app for production to the `build` folder.
 
 ## Dev & Not Dev Dependencies
 
+### `react-query`
+
+Used to manipulate async request, data fetching, cache and more (no redux / saga anymore).
+
+[Tutorial Link](https://www.youtube.com/watch?v=yccbCol546c), [Random Post](https://blog.bitsrc.io/how-to-start-using-react-query-4869e3d5680d) and [Creator Official Video](https://www.youtube.com/watch?v=seU46c6Jz7E).
+
 ### `commitlint`
 
 Used to check the commits before actually commits.