Add README file

Author: DanielChappuis

README.txt

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+ReactPhysics3D is an open source C++ physics engine library that can be used in 3D
+simulations and games. The library is released under the ZLib license.
+
+ReactPhysics3D has the following features :
+
+- Rigid body dynamics
+- Discrete collision detection
+- Collision shapes (Sphere, Box, Cone, Cylinder, Capsule, Convex Mesh)
+- Broadphase collision detection (Sweep and Prune using AABBs)
+- Narrowphase collision detection (GJK/EPA)
+- Collision response and friction (Sequential Impulses Solver)
+- Joints (Ball and Socket, Hinge, Slider, Fixed)
+- Sleeping technique for inactive bodies
+- Integrated Profiler
+- Multi-platform (Windows, Linux, Mac OS X)
+- Documentation (User manual and Doxygen API)
+- Examples
+- Unit tests
+
+Website : https://code.google.com/p/reactphysics3d/
+Author  : Daniel Chappuis