docs: add profile and car customization guide

Co-authored-by: Copilot <[email protected]>

readme.md

@@ -114,6 +114,34 @@ in [deploy/](./deploy). For a clean-install walkthrough on a fresh Pi, use
 
 For the remote server (receives trip logs + dashcam uploads), see [server/README.md](./server/README.md).
 
+## Customizing username and profile picture
+
+The top-right username and avatar in the local app are currently code-configured.
+
+### Change username
+
+Edit [modules/app_account.py](./modules/app_account.py):
+
+```python
+self.name = "quoije"
+```
+
+Set it to your preferred name, then restart the app/service.
+
+> Important: `account.name` is also used in the local SQLite filename (`db/sql/<name>_<car>.db` via [modules/app_sql.py](./modules/app_sql.py)).  
+> If you already have trip data and change the name, the app will create a new DB file unless you rename/migrate the existing one.
+
+### Change profile picture
+
+Current avatar is hardcoded in [templates/base.html](./templates/base.html) to:
+
+```html
+src="{{ url_for('static', filename='img/yaris.png') }}"
+```
+
+Simplest option: replace [static/img/yaris.png](./static/img/yaris.png) with your image (same filename/path).  
+Alternative: edit the `filename='img/yaris.png'` value in [templates/base.html](./templates/base.html).
+
 ## Project status
 
 Phases 1–24.7 are complete. The system is fully built and audited, ready for the Phase 25 real-vehicle test: