Added license (copied from codeplex)

Added readme (copied mostly from codeplex)

Signed-off-by: Martin Evans <martindevans@gmail.com>

License.txt

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+Original: http://sharpsteer.codeplex.com/license?ProjectName=sharpsteer
+
+The MIT License
+Copyright (c) 2007 Bj�rn Graf
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

readme.md

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+SharpSteer is a C# port of OpenSteer. Like OpenSteer, the aim of SharpSteer is to help construct steering behaviors for autonomous characters in games and animation, with a current implementation focus toward Microsoft's XNA.
+
+Like OpenSteer, SharpSteer provides a XNA-based application which demonstrates predefined steering behaviors. The user can quickly prototype, visualize, annotate and debug new steering behaviors by writing a plug-in for this Demo application.
+
+This fork of SharpSteer includes some changes for neatness of the code and better separation of the demo and the library applications.