add phi4 usage

Author: ks6088ts

docs/apps/15_streamlit_chat_slm.md

@@ -19,6 +19,51 @@ $ poetry run python apps/15_streamlit_chat_slm/summarize.py
 $ poetry run python -m streamlit run apps/15_streamlit_chat_slm/main.py
 ```
 
+## Usage
+
+### Use Phi4 model
+
+```shell
+$ time poetry run python apps/15_streamlit_chat_slm/chat.py --model phi4 --prompt "hello"
+{
+  "content": "Hello! How can I assist you today? If you have any questions or need information, feel free to let me know. 😊",
+  "additional_kwargs": {},
+  "response_metadata": {
+    "model": "phi4",
+    "created_at": "2025-01-09T03:16:19.661532868Z",
+    "message": {
+      "role": "assistant",
+      "content": ""
+    },
+    "done_reason": "stop",
+    "done": true,
+    "total_duration": 10662476906,
+    "load_duration": 10769327,
+    "prompt_eval_count": 23,
+    "prompt_eval_duration": 426000000,
+    "eval_count": 28,
+    "eval_duration": 10223000000
+  },
+  "type": "ai",
+  "name": null,
+  "id": "run-16375018-116e-422f-afd4-84692af42bd6-0",
+  "example": false,
+  "tool_calls": [],
+  "invalid_tool_calls": [],
+  "usage_metadata": {
+    "input_tokens": 23,
+    "output_tokens": 28,
+    "total_tokens": 51
+  }
+}
+poetry run python apps/15_streamlit_chat_slm/chat.py --model phi4 --prompt   1.48s user 0.12s system 12% cpu 12.455 total
+```
+
+Note:
+
+- Update Ollama to the latest version to run phi4 model
+- To use Ollama on WSL2, you may need to enable systemd. For more information, see [Use systemd to manage Linux services with WSL](https://learn.microsoft.com/en-us/windows/wsl/systemd#how-to-enable-systemd)
+
 # References
 
 - [ChatOllama](https://python.langchain.com/docs/integrations/chat/ollama/)