docs: add web UI screenshot to project README

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

WeatherPredictor/README.md

@@ -7,6 +7,8 @@ time, and predicts near-term local weather entirely on-device using the
 the forecast are shown on a small TFT and on a self-hosted web interface styled
 as a barometer instrument.
 
+![The Weather Predictor web interface, live from the station](WeatherPredictor.jpg)
+
 ## Features
 
 - **Local Zambretti forecast** from the 3-hour sea-level pressure trend (rising / steady / falling), adjusted for season.