Update README.md

Author: softchris

app/README.md

@@ -27,3 +27,7 @@ In `characters.json`, there's a `description` property that will be used as a sy
 
 > [!IMPORTANT]
 > DISCLAIMER: This repository contains fictional content generated by AI. The historical characters depicted here are speaking back thanks to generative AI, which is based on training data. Any utterances made by these characters do not represent their actual views or quotes. This content is intended solely for entertainment purposes. [Microsoft Responsible AI principles here](https://www.microsoft.com/en-us/ai/principles-and-approach/)
+
+## Credits
+
+- <https://pixabay.com/> on their free to use music.