Added license descriptions

Added the license description of the library and the external C-code of beckhoff.

README.md

@@ -7,4 +7,7 @@ This is a Modelica wrapper for TwinCATs ADS library. It provides functions for c
 Please also see related work in the Modelica community, e.g. [Modelica_DeviceDrivers](https://github.com/modelica/Modelica_DeviceDrivers) and AixLib´s [Communication Package](https://github.com/RWTH-EBC/AixLib/tree/development/AixLib/Utilities/Communication)
 
 # Acknowledgement
-This research was performed as part of the Energie Campus Nürnberg and supported by funding through the „Aufbruch Bayern (Bavaria on the move)” initiative of the state of Bavaria. 
+This research was performed as part of the Energie Campus Nürnberg and supported by funding through the „Aufbruch Bayern (Bavaria on the move)” initiative of the state of Bavaria. 
+
+# License
+This library is released under a modified version of the [Modelica License 2](https://www.modelica.org/licenses/ModelicaLicense2). Please consider the description in the UsersGuide of the package for a more detailed description. This library uses the C-API provided freely on the web by Beckhoff Automation GmbH. The API and all code provided by Beckhoff is property and copyright of [Beckhoff](https://infosys.beckhoff.de/content/1033/tc3_adsdll2/html/tcadsdll_intro.htm).