feat: add llamaproxy extras

Author: samuelint

README.md

@@ -22,12 +22,22 @@ If you find this project useful, please give it a star ⭐!
 pip install langchain-llamacpp-chat-model
 ```
 
+```bash
+# When using llama_proxy
+pip install langchain-llamacpp-chat-model langchain-llamacpp-chat-model[llama_proxy]
+```
+
 ##### poetry
 
 ```bash
 poetry add langchain-llamacpp-chat-model
 ```
 
+```bash
+# When using llama_proxy
+poetry add langchain-llamacpp-chat-model langchain-llamacpp-chat-model[llama_proxy]
+```
+
 ## Usage
 
 ### Using Llama