Update README.md

README.md

@@ -221,8 +221,12 @@ Need to install vllm nightly to get some recent changes
 pip install vllm --pre --extra-index-url https://wheels.vllm.ai/nightly
 ```
 
+Get vllm source code:
+```
+git clone git@github.com:vllm-project/vllm.git
+```
 
-Run the following under `vllm` source code root folder:
+Run the following under `vllm` root folder:
 
 ### baseline
 ```