Get started with a 3rd party notices doc based on https://github.com/mongodb/mongo/blob/master/distsrc/THIRD-PARTY-NOTICES

doc/third-party-notices.txt

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+ILSpy uses third-party libraries or other resources that may
+be distributed under licenses different than the ILSpy software.
+
+In the event that we accidentally failed to list a required notice,
+please bring it to our attention through any of the ways detailed here :
+
+           https://github.com/icsharpcode/ILSpy/issues
+
+The attached notices are provided for information only.
+
+For any licenses that require disclosure of source, sources are available at
+https://github.com/icsharpcode/ILSpy/.
+
+License Notice for AvalonDock (part of ILSpy)
+---------------------------
+
+License Notice for AvalonEdit
+---------------------------
+
+https://github.com/icsharpcode/AvalonEdit/blob/master/LICENSE
+
+MIT License
+
+Copyright (c) AvalonEdit Contributors (part of ILSpy)
+
+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 Notice for CommandLineUtils (part of ICSharpCode.Decompiler.Console)
+---------------------------
+
+License Notice for Data Grid Extensions (part of ILSpy)
+---------------------------
+
+License Notice for Humanizer (part of ICSharpCode.Decompiler)
+---------------------------
+
+License Notice for Iced (part of ILSpy.ReadyToRun)
+---------------------------
+
+License Notice for ILCompiler.Reflection.ReadyToRun (part of ILSpy.ReadyToRun)
+---------------------------
+
+License Notice for LightJson (part of ICSharpCode.Decompiler)
+---------------------------
+
+License Notice for Mono.Cecil (part of ILSpy)
+---------------------------
+
+License Notice for OSVersionHelper (part of ILSpy)
+---------------------------
+