Update README.md

Author: sunshineluyao

README.md

@@ -4,7 +4,7 @@
 
 # ⚛️ QSignAI
 
-### Quantum-Randomness-Seeded Identity Signatures at the Intersection of AI for Science and Science for AI
+### Quantum-Randomness-Seeded Identity Signatures at the Intersection of AI for Science and Science for AI [![DOI](https://zenodo.org/badge/1235249780.svg)](https://doi.org/10.5281/zenodo.20392816)
 
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