[eigen] Adding new robotics projects using Eigen in "Projects using Eigen" Documentation

[Justin Carpentier <jcarpent@xxxxxxx>]

Dear Eigen's developers,

I would like to mention some projects that we have been developing for robotic applications and that are based on Eigen:

In Robotics section:

Pinocchio: a fast and efficient Rigid Body Dynamics library (https://github.com/stack-of-tasks/pinocchio)

The Humanoid Path Planner: a software for Motion and Manipulation Planning (https://github.com/humanoid-path-planner)

In Bindings section:

Eigenpy: Efficient bindings between Numpy and Eigen using Boost.Python with support of the Geometry module (https://github.com/stack-of-tasks/eigenpy)

Thanks in advance for adding these projects to the list.
Best,

Justin Carpentier