Cannot configure docker container

[Th3S4mur41]

The documentation isn't exactly clear about how to configure plextraktsync when running the cocker container...

I tried to run the docker image in interactive mode as suggested in an old issue, but the container ends with an error

$ docker start -ia plextraktsync
INFO     PlexTraktSync [0.20.4]
Please enter your Plex username or e-mail: Error: Error running sync command:

The solution was as explained in Container stops/restart after creation - If no user configured to create the container manually instead of through docker compose.

This should be added to the documentation

[glensc]

So send the PR to add to documentation

[Th3S4mur41]

PR created 😉
#974