Added license files.

Author: stephen-fox

LICENSE

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+MIT License
+
+Copyright (c) 2020 Stephen Fox Jr.
+
+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.
+

LICENSE-THIRD-PARTY.md

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+# github.com/icsharpcode/ILSpy
+ILSpy is the open-source .NET assembly browser and decompiler.
+
+Website: https://ilspy.net/
+Found a bug? https://github.com/icsharpcode/ILSpy/issues/new
+
+Copyright 2011-2020 AlphaSierraPapa for the ILSpy team
+Current and past contributors: https://github.com/icsharpcode/ILSpy/graphs/contributors
+
+ILSpy is distributed under the MIT License. There is only one first-party component that has a different license:
+ SharpTreeView: LGPL
+
+ILSpy uses other open-source libraries to make its magic happen, and we want to thank the people working
+on those components! For the respective licenses and copyright information please see third-party notices.