Add RTD Denver app for real-time transit arrivals

[wfmer]

RTD Denver - Real-time Transit Arrivals

This app displays live bus and train arrival times for Denver RTD (Regional Transportation District) stops.

Features

• Real-time arrival predictions from RTD's official GTFS-Realtime feed
• User-configurable stop ID (find yours at rtd-denver.com)
• Color-coded urgency based on configurable walk time
• Shows up to 3 upcoming arrivals
• Updates every 25 seconds

Data Source

• RTD's public GTFS-RT feed (no API key required)
• Converted from protobuf to JSON via public proxy hosted on Google Cloud Run
• Proxy URL: https://rtd-proxy-194821693431.us-central1.run.app

Configuration Options

• Stop ID: Enter your RTD stop ID
• Walk Time: Set your walk time (5/10/15/20 min ) for color coding

Color Coding

• 🔴 Red: Less than walk time (too late to catch)
• 🟡 Yellow: Walk time to walk time + 8 min (leave soon)
• 🟢 Green: More than walk time + 8 min (plenty of time)

Testing

Tested with stop ID 11981 (Route 3 bus stop). App successfully displays real-time arrivals and updates regularly.

[tidbyt]

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