Split off documentation

Documentation/readme.txt

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+Aerofoil is a third-party port of Glider PRO
+
+Glider PRO is (c)1994-2000 Casady & Greene, Inc., written by John Calhoun
+Aerofoil is (c)2019-2020 Eric Lasota
+
+Requires Windows 8 and the Visual Studio 2017 redistributable runtime.
+Please see this page for more info:
+https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
+
+XInput gamepads are supported.  Other gamepads may be supported via third-party software that maps them to XInput (i.e. PS4 gamepads are supported via DS4Windows)
+
+Some shortcuts:
+- While in-game, Ctrl-S saves the game.  You can then reload the game from the main menu.
+- Ctrl-Q quits the game.
+
+
+
+-------------------------------------------------------------------------------
+Roboto font:
+(c)2011 Google
+Distributed under the Apache License (see license_apache.txt)
+
+-------------------------------------------------------------------------------
+Open Sans font:
+(c)2011 Google
+Distributed under the Apache License (see license_apache.txt)
+
+
+-------------------------------------------------------------------------------
+stb_image_write:
+Created by Sean Barrett
+
+
+-------------------------------------------------------------------------------
+LIBICONV:
+Copyright (C) 1999-2001, 2016 Free Software Foundation, Inc.
+
+Distributed under the LGPLv2 license (See license_lgplv2.txt)
+
+
+-------------------------------------------------------------------------------
+RapidJSON:
+Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.  All rights reserved.
+
+Distributed under the MIT license (See license_rapidjson.txt)
+
+
+-------------------------------------------------------------------------------
+zlib:
+
+ (C) 1995-2017 Jean-loup Gailly and Mark Adler
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Jean-loup Gailly        Mark Adler
+  jloup@gzip.org          madler@alumni.caltech.edu