Readme worker update

Description

Updates the README to include instructions on how to start a worker.

Changes

Additions

• Added example commands for docker and the jar
• Added tables of environment variables and arguments

Review

To be filled in by the reviewers

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date