Add MTA Next Train community ability

community/mta-next-train/README.md

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+# MTA Next Train
+
+![Community](https://img.shields.io/badge/OpenHome-Community-orange?style=flat-square)
+![Author](https://img.shields.io/badge/Author-@chadnewbry-lightgrey?style=flat-square)
+
+Live New York City subway arrivals for OpenHome. Ask for your next train using a saved default station, or ask for a specific line and station on demand.
+
+## What It Does
+
+- Reads live subway arrivals from `SubwayInfo.nyc` with no API key required
+- Saves one default station so the shortest prompt can be "when's my next train?"
+- Handles explicit station requests like "next Q train at Union Square"
+- Supports simple direction filters like "northbound" or "downtown"
+- Lets the user change their default station by voice
+
+## Trigger Words
+
+- `mta next train`
+- `next subway`
+- `subway arrivals`
+- `nyc mta`
+
+## Setup
+
+This ability uses `SubwayInfo.nyc` and does not require an API key.