Add doosan m1013

[Bigenlight]

Description

Hello! This PR add M1013 from Doosan Robotics! I'm uploading just m1013 series first, MJX(working on Playground) and m0609 will be prepared soon.

The 2f85 gripper in the image is not equipped right now. (As I know only fully new model are allowed so..)

• I also updated the table in readme!

Fixes: #175

Checklist

Please check off each item ([x]) once complete, or mark it as [N/A] if it doesn't apply:

• Added your name to CONTRIBUTORS.md (alphabetically by first name)
• Updated CHANGELOG.md:
  • [N] Global changelog (if your change affects the overall repo)
  • Model-specific changelog (if it affects a specific model only)
• Followed the XML formatting/style guidelines (if editing MJCF)
• Ran pytest test/ locally and ensured all tests pass
• Signed the Contributor License Agreement (CLA)

Refer to the contributing guide if you're unsure about any of the steps.