readme: improve content

README.md

-## FCL -- The Flexible Collision Library
+HPP-FCL — An extension of the Flexible Collision Library
+=======
 
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-This project is a fork from https://github.com/flexible-collision-library/fcl.
-
-The main differences are.
+This project is initially a fork from https://github.com/flexible-collision-library/fcl and has evolved since then.
+The main new features are:
 - the use of a safety margin when detecting collision,
 - the computation of a lower bound of the distance between two objects when collision checking is performed and no collision is found.
+- the implementation of Python bindings for easy code prototyping.
+- the fix of various bugs.
+
+This project is now used in many robotics frameworks such as [Pinocchio](https://github.com/stack-of-tasks/pinocchio), an open-source software which implements efficient and versatile rigid body dynamics algorithms and the [Humanoid Path Planner](https://humanoid-path-planner.github.io/hpp-doc), an open-source software for Motion and Manipulation Planning.
+
+## Acknowledgments
+
+The development of **HPP-FCL** is actively supported by the [Gepetto team](http://projects.laas.fr/gepetto/) [@LAAS-CNRS](http://www.laas.fr)