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Attach existing volume to container with docker-compose

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`docker volume create my_vol`

in docker-compose.yml, declare volumes with property `external: true`. This tells docker compose not to create volumes.

If external = false, then docker compose will prefix the volume declared with the directory name.

Example:

/home
  /sam
    /docker
      /my_app
        - docker-compose.yml

The volume name will end up being `my_app_my_vol`

Example docker-compose.yml:

```
version: "3"
volumes:
  my_vol:
    external: true

services:
  my_app:
    volumes:
      - my_vol:/data <-- attach volume to /data inside container

...
...

```

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