Filip d147 patch 1 (#19)

* Update README.md

Updated information for CLA to CLA Assistant

* Delete Siemens_CLA_1.1.pdf

Deleted CLA PDF

README.md

@@ -16,4 +16,4 @@ The TIA portal project and the corresponding documentation can be found in the d
 Thank you for your interest in contributing. Anybody is free to report bugs, unclear documentation, and other problems regarding this repository in the Issues section.
 Additionally everybody is free to propose any changes to this repository using Pull Requests.
 
-If you are interested in contributing via Pull Request, please check the [Contribution License Agreement](Siemens_CLA_1.1.pdf) and forward a signed copy to [industrialedge.industry@siemens.com](mailto:industrialedge.industry@siemens.com?subject=CLA%20Agreement%20Industrial-Edge).
+If you haven't previously signed the [Siemens Contributor License Agreement](https://cla-assistant.io/industrial-edge/) (CLA), the system will automatically prompt you to do so when you submit your Pull Request. This can be conveniently done through the CLA Assistant's online platform. Once the CLA is signed, your Pull Request will automatically be cleared and made ready for merging if all other test stages succeed.