Translate docs and helpers to English, add GPLv3

README.md

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+# Bluemap Simple Hidder
+
+JavaScript snippet to hide and show the player-icon container in BlueMap's web viewer. On load it hides the container and exposes global helpers to toggle visibility.
+
+## How it works
+- Uses the CSS selector `#map-container > div > div:nth-child(2)` to find the container that renders player icons.
+- Hides the container as soon as the script runs.
+- Exposes two global functions: `close_sesame` to hide and `open_sesame` to show the icon container.
+
+## Quick start
+1. Open your BlueMap web instance.
+2. Inject `PlayerHidder.js` into the page (for example, as an extra script in BlueMap's web folder or by pasting the code into the browser console with the map open).
+3. Player markers will hide automatically. Run `close_sesame()` or `open_sesame()` in the console to toggle visibility.
+
+## Customizing
+- If your DOM differs, adjust the `selector` value in `PlayerHidder.js` to target the correct container.
+
+## License
+- This project is licensed under the GNU General Public License v3.0. See `LICENSE` for details.