Add LICENSE and README

LICENSE

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+MIT License
+
+Copyright (c) 2026 DA6KM
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# DMRmap
+
+A web app that visualizes DMR repeaters on an interactive map. Filter by band, search by address, and find repeaters along a driving route.
+
+**Live:** https://dmrmap.kida.io
+
+## Features
+
+- Full-screen OpenStreetMap with DMR repeater markers (blue for 2m, red for 70cm)
+- Band filtering (2m / 70cm / both)
+- Address-to-address routing with repeater corridor search (10 km)
+- Address autocomplete via Nominatim
+- Driving routes via OSRM
+- Coordinate display with Maidenhead grid locator
+- Dark mode (follows system preference, manual toggle)
+- No external CDN dependencies — all assets served locally
+
+## Requirements
+
+- Go 1.25+
+- Docker (optional)
+
+## Running locally
+
+```sh
+go run .
+```
+
+Open http://localhost:8080. The SQLite database is seeded automatically from `rptrs.json` on first startup.
+
+## Docker
+
+```sh
+docker compose up --build
+```
+
+The database is persisted in a named volume across restarts.
+
+## Development
+
+Hot-reload with [air](https://github.com/air-verse/air):
+
+```sh
+docker compose -f compose.dev.yml up --build
+```
+
+## Data
+
+Repeater data provided by [RadioID](https://radioid.net/database/dumps). This project is not affiliated with or endorsed by RadioID.
+
+## License
+
+[MIT](LICENSE)