TR-25 Added YouTube presentation link and did some minor clean up.

Author: jeshoward

README.md

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 [![License](https://img.shields.io/badge/License-BSD%203--Clause-blue.svg)](https://opensource.org/licenses/BSD-3-Clause) Software License 
 
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 # Randomly Exploring Random Tree Path Planner ROS Plugin
 This plugin implements a simulated Randomly Exploring Random Tree (RRT) path planner for the Kinetic Kame release of the Robot Operating System (ROS) framework. It uses the nav_core::BaseGlobalPlanner interface and can be used on any platforms that implement the move_base package, but has been specifically tested using the simulated Turtlebot platform.