Add Paper and GitHub reference

README.md

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 GermanMedBERT-based model of the GPTNERMED German NER model for medical entities.
 
+See our published paper at: [https://doi.org/10.1016/j.jbi.2023.104478](https://doi.org/10.1016/j.jbi.2023.104478) \
+The preprint paper is available at: [https://arxiv.org/abs/2208.14493](https://arxiv.org/abs/2208.14493) \
+If you like our work, give us a star on our GitHub repository: [https://github.com/frankkramer-lab/GPTNERMED](https://github.com/frankkramer-lab/GPTNERMED) \
+
 | Feature | Description |
 | --- | --- |
 | **Name** | `de_GPTNERMED_GermanMedBERT` |