doc: expose Large-scale EP design and implementation tech blog in the main… (NVIDIA#4960)

Signed-off-by: Jun Yang <[email protected]>

Author: juney-nvidia

README.md

@@ -18,6 +18,9 @@ TensorRT-LLM
 <div align="left">
 
 ## Tech Blogs
+* [06/05] Scaling Expert Parallelism in TensorRT-LLM (Part 1: Design and Implementation of Large-scale EP)
+✨ [➡️ link](./docs/source/blogs/tech_blog/blog4_Scaling_Expert_Parallelism_in_TensorRT-LLM.md)
+
 * [05/30] Optimizing DeepSeek R1 Throughput on NVIDIA Blackwell GPUs: A Deep Dive for Developers
 ✨ [➡️ link](./docs/source/blogs/tech_blog/blog3_Optimizing_DeepSeek_R1_Throughput_on_NVIDIA_Blackwell_GPUs.md)