Create LICENSE with content based on Doc/LICENSE.TXT (#427)

Reasoning is to have the license at the standard location where Github and others expect to find it.

LICENSE

@@ -0,0 +1,112 @@
+Copyright © 2004-2023 Giles C Williams and contributors.
+
+This work is licensed under the GNU General Public License version 2.
+
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License
+    as published by the Free Software Foundation; either version 2
+    of the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+    MA 02110-1301, USA.
+
+
+
+
+Additionally, all artwork – 3D models, images and sounds – included in
+the work, as well as configuration files, are also licensed under the
+Creative Commons Attribution-NonCommercial-ShareAlike License version
+3.0. This means that these files may be distributed under either license
+at your discretion.
+To view a copy of Attribution-NonCommercial-ShareAlike license, visit
+http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
+Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305,
+USA.
+
+    You are free:
+      • to Share — to copy, distribute and transmit the work
+      • to Remix — to adapt the work
+
+    Under the following conditions:
+      • Attribution. You must attribute the work in the manner
+        specified by the author or licensor (but not in any way that
+    	suggests that they endorse you or your use of the work).
+      • Noncommercial. You may not use this work for commercial purposes.
+      • Share Alike. If you alter, transform, or build upon this work,
+        you may distribute the resulting work only under the same or
+    	similar license to this one.
+
+    For any reuse or distribution, you must make clear to others the
+    license terms of this work. Any of the above conditions can be waived
+    if you get permission from the copyright holder. Apart from the remix
+    rights granted under this license, nothing in this license impairs or
+    restricts the author’s moral rights.
+    Your fair dealing and other rights are in no way affected by the above.
+    This is a human-readable summary of the Legal Code (the full license).
+
+
+
+
+The source code distribution and the Mac OS X version of Oolite contain
+parts subject to the following license:
+
+   VirtualRingBuffer
+   Copyright © 2002, Kurt Revis. 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 Snoize 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
+    OWNER 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.
+
+
+The MiniZip code used is subject to the following license
+
+License
+----------------------------------------------------------
+   Condition of use and distribution are the same than zlib :
+
+  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.
+
+----------------------------------------------------------