Add TALOS Humanoid Robot from PAL Robotics

[saikishor]

URL for the existing model source (e.g. URDF)

TALOS URDF: https://github.com/pal-robotics/talos_robot/tree/kinetic-devel/talos_description/robots

License terms of the upstream model

TALOS will be with Apache License 2.0

What do you think is required to convert and tune this model for MuJoCo?

Being able to convert from the URDF to MuJoCo using the compile command
We need to add the actuators to the model for better joint actuation
Stability of the model w.r.t to the actuator's gain tuning

Are you proposing to help develop and maintain the new model?

Yes, we can develop and help maintain the new model. It is in our interest as a part of the @pal-robotics team.