Add citation to index.html

Added citation information for SeFNet article.

Author: wi1lku

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@@ -31,6 +31,16 @@ <h2>Annotated Features</h2>
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     The graph above shows the relationship of annotated terms based on the taxonomy introduced in SNOMED-CT.
     <h2>Citation</h2>
+    <p>If you use this resource, please cite:</p>
+    <pre><code>@article{woznica2026sefnet,
+    title={SeFNet: Linking tabular datasets with semantic feature nets},
+    author={Wo{\'z}nica, Katarzyna and Wilczy{\'n}ski, Piotr and Biecek, Przemys{\l}aw},
+    journal={Information Fusion},
+    volume={125},
+    pages={103436},
+    year={2026},
+    publisher={Elsevier}
+  }</code></pre>
   </div>
 
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