Clarify tutorials are BSDv3 licensed (#432)

LICENSE.txt

@@ -0,0 +1,30 @@
+BSD 3-Clause License
+
+Copyright (c) 2008-2013, Willow Garage, Inc.
+Copyright (c) 2015-2019, PickNik, LLC.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -6,6 +6,8 @@ This is the primary documentation for the MoveIt project. We strongly encourage
 
 These tutorials use the [reStructuredText](http://www.sphinx-doc.org/en/stable/rest.html) format commonly used in the Sphinx "Python Documentation Generator". This unfortunately differs from the common Markdown format, but its advantage is that it supports embedding code directly from source files for inline code tutorials.
 
+All content in this repository is open source and released under the [BSD License v3](https://opensource.org/licenses/BSD-3-Clause). Each individual source code file should contain a copy of the license.
+
 This repository is currently built automatically by two systems. Travis builds the documentation for Melodic and ROS Build Farm builds the documentation for older versions:
 - [![Travis Status](https://travis-ci.org/ros-planning/moveit_tutorials.svg?branch=master)](https://travis-ci.org/ros-planning/moveit_tutorials) [Github Pages + Travis](https://ros-planning.github.io/moveit_tutorials/): latest
 - [![ROS Melodic Build Farm Status](http://build.ros.org/buildStatus/icon?job=Mdoc__moveit_tutorials__ubuntu_bionic_amd64)](http://build.ros.org/job/Mdoc__moveit_tutorials__ubuntu_bionic_amd64/) [ROS Melodic Build Farm](http://docs.ros.org/melodic/api/moveit_tutorials/html/)