docs: add Diffusion-Planner_v3.0 reference blog link

README.md

@@ -65,6 +65,7 @@ Think of two stages glued on one BEV map. Cameras are encoded by HENet-tiny and
 
 ### Official Repo and Paper
 
+Horizon reference algorithm blog (Diffusion-Planner_v3.0): https://developer.horizon.auto/blog/14190
 NAVSIM benchmark: https://github.com/autonomousvision/navsim
 Paper: https://arxiv.org/abs/2406.15349
 SparseBEV-style det head repo: https://github.com/MCG-NJU/SparseBEV