Update README.md

Author: zrgt

README.md

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 # aas-python-http-client
-Mostly generated python client for AAS API based on models from Basyx-Python-SDK. 
+Mostly generated python client for AAS API based on models from [Basyx-Python-SDK](https://github.com/eclipse-basyx/basyx-python-sdk). 
 
 All APIs of the Specification of the [Specification of the Asset Administration Shell: Part 2](http://industrialdigitaltwin.org/en/content-hub) in one collection.