[Advice] Add MPM

[dsolmann]

I'll just leave this idea here. MPM (Material Point Method) is a great thing for simulation of Rigid Bodies interactions. Some examples:

• Bread getting tore away in simulation: https://www.youtube.com/watch?v=lNri-x2nK7o
• Foams, Sponges, Viscotic Liquids: https://www.youtube.com/watch?v=nXck0xs7oyw