add a bit of documentation

.env.example

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+WIREGUARD_PRIVATE_KEY=your_key_here

README.md

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+# Z420 media stack
+
+Media services running on z420
+
+## services
+
+- gluetun
+- jellyfn
+- qbittorrent
+- bazarr
+- radarr
+- sonarr
+
+## setup
+
+1. Make .env file and fill with private keys
+2. Deploy with 'docker compose up -d'
+
+## data
+
+All data is stored in /var/lib/z420