Get file:

$ wget https://bytesofprogress.net/resources/docker-compose/qbittorrent/docker-compose.yml

Contents of file: 

services:
  qbittorrent:
    image: lscr.io/linuxserver/qbittorrent:latest
    container_name: qbittorrent
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Etc/UTC
      - WEBUI_PORT=8080
      - TORRENTING_PORT=6881
    volumes:
      - /path/to/qbittorrent/appdata:/config
      - /path/to/downloads:/downloads #optional
    ports:
      - 8080:8080
      - 6881:6881
      - 6881:6881/udp
    restart: unless-stopped

Additional information: It will give you a temporary password for your first login in the console output.