created bind mount compose file

Tautulli/.env.example

@@ -13,6 +13,9 @@ TAUTULLI_TZ=America/Los_Angeles
 # Host port to expose the Tautulli web UI on
 TAUTULLI_PORT=8181
 
+# Bind mount path on the host for the Tautulli config directory (e.g. /opt/tautulli/config)
+TAUTULLI_CONFIG_PATH=
+
 # NFS server hostname or IP address
 TAUTULLI_NFS_SERVER=