add lightllm adoption (#871)

ref https://github.com/ModelTC/lightllm/pull/737/files

Author: zhyncs

README.md

@@ -150,6 +150,7 @@ We are thrilled to share that FlashInfer is being adopted by many cutting-edge p
 - [TGI](https://github.com/huggingface/text-generation-inference)
 - [lorax](https://github.com/predibase/lorax)
 - [TensorRT-LLM](https://github.com/NVIDIA/TensorRT-LLM)
+- [LightLLM](https://github.com/ModelTC/lightllm)
 
 ## Acknowledgement