updated README and added .env example

.env.example

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+# Copy this file to `.env` and fill in your real values.
+# `.env` is gitignored so your secrets stay local.
+
+# Your Discord bot token (Developer Portal -> your app -> Bot -> Reset/Copy Token).
+BOT_TOKEN=your-bot-token-here
+
+# Numeric ID of your test server, so /hello registers instantly as a guild command.
+# Enable Developer Mode in Discord, right-click the server, "Copy Server ID".
+# Leave unset to register /hello globally (can take up to an hour to appear).
+GUILD_ID=123456789012345678
+
+# Lavalink server the bot connects to for music playback.
+# In docker-compose the bot reaches Lavalink at ws://lavalink:2333 (set there);
+# ws://localhost:2333 is the default for running the bot outside a container.
+LAVALINK_URI=ws://localhost:2333
+# Shared secret between the bot and the Lavalink server. docker-compose passes
+# this same value to the server as LAVALINK_SERVER_PASSWORD, so the two always
+# match. Set a strong value — do NOT ship the youshallnotpass default.
+LAVALINK_PASSWORD=change-me
+
+# Path to the catchphrases file (one phrase per line). Optional; defaults to
+# catchphrases.txt in the working directory.
+CATCHPHRASES_FILE=catchphrases.txt