Add README dora-rs usage documentation for dora-openarm node I/O

[Copilot]

Fix GH-9

The README did not describe how to use this package as a dora-rs node or what inputs and outputs it exposes. This updates the documentation to make the node interface explicit from the README alone.

[kou]

@copilot This is used as a dora-rs node. So we should add a sample dora-rs dataflow configuration instead of command line signature.

For data collection:

nodes:
  # ...
  - id: follower-right
    build: pip install dora-openarm
    path: dora-openarm
    args: "--side right --align-trigger gripper"
    inputs:
      # Event ID is only used. Event value isn't used.
      request_position: leader/right_follower_position
      move_position: leader/right_follower_position
    outputs:
      - position
      - status

  - id: follower-left
    build: pip install -e nodes/dora-openarm
    # build: pip install dora-openarm
    path: dora-openarm
    # Please configure!
    args: "--side left --align-trigger gripper"
    inputs:
      # Event ID is only used. Event value isn't used.
      request_position: leader/left_follower_position
      move_position: leader/left_follower_position
    outputs:
      - position
      - status
  # ...

Add a link to https://github.com/enactic/dora-openarm-data-collection for full example configuration.

[Copilot]

Updated in e153946. The README usage section now shows a dora-rs dataflow YAML example and links to the full dora-openarm-data-collection configuration.

[kou]

@copilot Use table not list.

[Copilot]

Updated in e153946. The README inputs and outputs are now documented with tables instead of lists.

[Copilot]

Pull request overview

Updates the repository README to fully document how dora-openarm is used as a dora-rs node, including its CLI arguments and the Dora input/output interface, so users can configure it correctly from the README alone.

Changes:

• Added a sample dora-rs dataflow YAML snippet for running dora-openarm as a node.
• Documented node CLI arguments (--side, --config, alignment options, stop/refresh flags) in a table.
• Documented the Dora interface with explicit Inputs/Outputs tables and clarified accepted data shapes (including move_position struct form and state output structure).