layers:
- Web:
    nodes:
    - WebLB:
        ports:
        - 80/tcp
        - 443/tcp
        type: LB
        url: https://github.com/otahi/network_drawer/
    - Web001:
        ports:
        - 80/tcp
    - Web002:
        ports:
        - 80/tcp
  layers:
  - Image:
      nodes:
        ImageWeb001:
          ports:
          - 80/tcp
        ImageWeb002:
          ports:
          - 80/tcp
- App:
    nodes:
    - AppLB:
        ports:
        - 80/tcp
        - 25/tcp
        type: LB
    - App001:
        ports:
        - 80/tcp
        - 25/tcp
    - App002:
        ports:
        - 80/tcp
        - 25/tcp
nodes:
- Browser:
  type: Client
- Mail Server:
  type: Client
connections:
- from: Browser
  to: WebLB:80/tcp
  type: HTTP
- from: Browser
  to: WebLB:443/tcp
- from: Mail Server
  to: AppLB:25/tcp
  type: SMTP
- from: WebLB
  to: Web001:80/tcp
  type: HTTP
- from: WebLB
  to: Web002:80/tcp
  type: HTTP
- from: Web001
  to: AppLB:80/tcp
  type: HTTP
- from: Web002
  to: AppLB:80/tcp
  type: HTTP
- from: AppLB
  to: App001:25/tcp
  type: SMTP
- from: AppLB
  to: App001:80/tcp
  type: HTTP
- from: AppLB
  to: App002:25/tcp
  type: SMTP
- from: AppLB
  to: App002:80/tcp
  type: HTTP

Add yaml file as an example
Add yaml file as an example
