[DOC]: Add process for creating a new Task handler to CONTRIBUTING.md

How would you describe the priority of this documentation request

Would be nice

Describe the future/missing documentation

This will add a new CONTRIBUTING.md section that outlines the steps for adding a new processing task type, and making it available for use via the client library and cli interface.

• Task Definition:
  • The process for adding a new task to the CLI and library, including --task specification, and configuration options.
• Processing Module:
  • How to create a new stage/module that checks a control message for a specified task, extracts the task, operates on the message payload, updates the appropriate elements, and forwards the control message to the next stage.
  • How to add the new stage/module to the pipeline
  • Setting up the module for proper unit testing.

Where have you looked?

No response

Start with CONTRIBUTING.md and trace how task types are exposed through the client library and CLI, including the --task specification and configuration options. Then review the processing stage/module pipeline and its unit tests. Done means a clear section covers task definition, module behavior, pipeline registration, and testing steps.