Add README

Author: ty-porter

README.md

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+# MLB LED Scoreboard Config Editor
+
+A web-based GUI for generating configuration files for the [mlb-led-scoreboard](https://github.com/MLB-LED-Scoreboard/mlb-led-scoreboard) project.
+
+## Features
+
+- Edit `config.json`, `colors/teams.json`, `colors/scoreboard.json`, and `coordinates/wXhY.json` through a form UI
+- Select any tagged release version (v9+) or the `dev` branch
+- Download or copy the generated JSON output
+
+## Usage
+
+Open the site and select a schema version. Fill out the form fields, then use the **Download** or **Copy** button to get your JSON file. Place the downloaded files in your mlb-led-scoreboard installation directory.