added article="This interface is based on [BookNLP](https://github.com/booknlp/booknlp)."

app.py

@@ -76,7 +76,8 @@ def gradio_interface():
         inputs=file_input, 
         outputs=file_output, 
         title="BookNLP Processor with Ebook Support",
-        description=description
+        description=description,
+        article="This interface is based on [BookNLP](https://github.com/booknlp/booknlp)."
     ).launch()
 
 if __name__ == "__main__":