Adding MaMUJOCO to benchmarl

[BharathRajM]

Hey team,

I see that you've included the pettingzoo environments, how do you think one should go about to include the MaMUJOCO environments from here:

https://robotics.farama.org/envs/MaMuJoCo/index.html

[matteobettini]

Hey @BharathRajM

Thanks for opening this, I do love that benchmark!

Any pettingzoo compatible env should work with BenchMARL

To add this, you can follow this example #84

It should not be to hard to integrate it (see the other simulators for example)

I would be happy to review a PR if you wanna do this!