Add fastlane metadata for F-Droid and Play Store

- Store listing: title, short/full descriptions
- Changelog for initial release
- Icon and feature graphic
- phoneScreenshots directory (to be populated)

fastlane/metadata/android/en-US/full_description.txt

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+Tether API exposes your phone's connection status via a local HTTP API, accessible from tethered devices like laptops.
+
+Perfect for integrating phone status into desktop widgets, status bars (waybar, polybar), or custom scripts.
+
+Features:
+• Auto-start when tethering is enabled
+• Real-time connection info: 5G, LTE, 3G, WiFi
+• Signal strength in dBm and bars (0-4)
+• Carrier name and roaming status
+• Battery level and charging state
+• Simple REST API with JSON responses
+• No root required
+
+API Endpoints:
+• GET /status - Full phone status
+• GET /health - Health check
+
+Example usage from your laptop:
+curl http://192.168.42.1:8765/status
+
+Use cases:
+• Waybar/polybar modules showing phone signal
+• KDE Plasma widgets
+• Custom scripts and automation
+• Any app that can make HTTP requests
+
+The server runs on port 8765 and is only accessible from your tethered device, not the internet.