📝 Update release notes

Author: tiangolo

docs/en/docs/release-notes.md

@@ -14,6 +14,34 @@ hide:
 * ✨ Add FastAPI CLI, the new `fastapi` command. PR [#11522](https://github.com/tiangolo/fastapi/pull/11522) by [@tiangolo](https://github.com/tiangolo).
     * New docs: [FastAPI CLI](https://fastapi.tiangolo.com/fastapi-cli/).
 
+Try it out with:
+
+```console
+$ pip install --upgrade fastapi
+
+$ fastapi dev main.py
+
+
+ ╭────────── FastAPI CLI - Development mode ───────────╮
+ │                                                     │
+ │  Serving at: http://127.0.0.1:8000                  │
+ │                                                     │
+ │  API docs: http://127.0.0.1:8000/docs               │
+ │                                                     │
+ │  Running in development mode, for production use:   │
+ │                                                     │
+ │  fastapi run                                        │
+ │                                                     │
+ ╰─────────────────────────────────────────────────────╯
+
+INFO:     Will watch for changes in these directories: ['/home/user/code/awesomeapp']
+INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
+INFO:     Started reloader process [2248755] using WatchFiles
+INFO:     Started server process [2248757]
+INFO:     Waiting for application startup.
+INFO:     Application startup complete.
+```
+
 ### Refactors
 
 * 🔧 Add configs and setup for `fastapi-slim` including optional extras `fastapi-slim[standard]`, and `fastapi` including by default the same `standard` extras. PR [#11503](https://github.com/tiangolo/fastapi/pull/11503) by [@tiangolo](https://github.com/tiangolo).