new file: .env.example

modified:   README.md

.env.example

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+# Spotify API Credentials
+SPOTIPY_CLIENT_ID=deine_spotify_client_id
+SPOTIPY_CLIENT_SECRET=dein_spotify_client_secret
+SPOTIPY_REDIRECT_URI=http://localhost:5000/callback
+
+# Flask Secret Key
+SECRET_KEY=dein_geheimer_flask_key
+
+# Flask Umgebung (optional)
+FLASK_ENV=development