Added video link

README.md

@@ -47,7 +47,7 @@ achievement:
      ║  FILL THESE IN — replace each REPLACE_ME with your real URL.   ║
      ╚═══════════════════════════════════════════════════════════════╝ -->
 [space]:  https://huggingface.co/spaces/build-small-hackathon/CodeFlow  "Hugging Face Space"
-[video]:  REPLACE_ME  "Demo video"
+[video]:  https://youtu.be/R5GbpN9FVxo  "Demo video"
 [social]: REPLACE_ME  "Social post"
 [blog]:   https://huggingface.co/blog/build-small-hackathon/codeflow-field-notes  "Field notes / blog post"
 [traces]: https://huggingface.co/datasets/build-small-hackathon/codeflow-agent-traces  "Agent traces dataset"