📝 Add trademarks and disclaimer section to README

Author: shinaji

README.md

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+## Trademarks and Disclaimer
+
+* **Trademarks**:
+  NTAG, MIFARE, and NXP are registered trademarks of NXP B.V. This project is an independent open-source implementation
+  and is not affiliated with, endorsed by, or sponsored by NXP B.V.
+* **Accuracy of Information**:
+  This SDK is developed based on publicly available datasheets. While every effort has been made to ensure the accuracy
+  of the implementation, the author makes no guarantees regarding its suitability for any specific purpose.
+* **Limitation of Liability**:
+  In no event shall the author be liable for any damages arising from the use of this software, including but not
+  limited to hardware damage (NFC tags, readers, etc.), data loss, or "bricking" of tags due to incorrect AES key
+  configuration or authentication failures. Use this software at your own risk.