docs: changed doku URL in README

FitConnect/README.md

@@ -5,7 +5,7 @@
 This project is an SDK that allows a user to create easily a submission and send that submission via FIT-Connect to the
 respective destination.
 The user manual and how to use information can be found on the official documentations page
-of [FIT-Connect](https://docs.fitko.de/fit-connect)
+of [FIT-Connect](https://docs.fitko.de/fit-connect/docs/sdks/net-sdk/overview)
 
 ### Prerequisite