Add docs for adding new robot

[yuecideng]

Description

• Added new tutorial docs/source/tutorial/add_robot.rst covering two
  approaches for robot definition:
  • Single-file approach (for simple robots like CobotMagic)
  • Package-based approach (for complex robots like DexforceW1)
• Documented key configuration parameters: URDF configuration, control
  parts, drive properties, IK solver settings
• Added section on creating robot documentation in
  docs/source/resources/robot/
• Updated AGENTS.md with references to the new tutorial and robot docs
  requirement

Type of change

• Documentation update

Checklist

• I have run the black . command to format the code base.
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• Dependencies have been updated, if applicable.

[Copilot]

Pull request overview

Adds a new “Adding a New Robot” tutorial to the Sphinx docs and links it from existing documentation so contributors have a clear guide for robot definitions and required robot docs pages.

Changes:

• Added a new tutorial page add_robot.rst describing single-file and package-based robot definitions and key configuration knobs.
• Linked the new tutorial from docs/source/tutorial/index.rst.
• Updated AGENTS.md to point contributors to the new tutorial and robot documentation requirements.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 7 comments.

File	Description
docs/source/tutorial/index.rst	Adds add_robot to the tutorials toctree so it appears in the docs navigation.
docs/source/tutorial/add_robot.rst	New tutorial content covering robot implementation patterns and required documentation.
AGENTS.md	Updates contributor guidance to reference the new tutorial and robot docs index requirements.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.