Add repository citation and ORCID

Adds a repository-specific BibTeX citation, ORCID identifier, and upstream citation guidance. Existing card content and metadata are preserved.

README.md

@@ -10,4 +10,20 @@ pinned: true
 license: apache-2.0
 ---
 
-Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference
+
+<!-- gokaygokay-citation -->
+## Citation and attribution
+
+This hosted interface is maintained by [Gökay Aydoğan](https://orcid.org/0000-0002-2343-9433). If you reference this repository in academic work, please cite it as follows and also cite the upstream models, datasets, or projects it builds upon.
+
+```bibtex
+@software{aydogan2024ponyrealism,
+  author = {Aydoğan, Gökay},
+  title = {{PonyRealism}},
+  year = {2024},
+  publisher = {Hugging Face},
+  url = {https://huggingface.co/spaces/gokaygokay/PonyRealism},
+  note = {Hosted interface; cite the upstream models and projects used by this Space as required.}
+}
+```