Move .NET code into dotnet/

dotnet/README.md

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+
+This directory contains a .NET interface for Rubber Band Library,
+generously contributed by Jonathan Gilbert under a BSD-like
+licence. The directory `rubberband-sharp` contains a managed-code
+interface to Rubber Band in C#. It loads and uses the DLL defined in
+`rubberband-dll`, that wraps the Rubber Band Library with an API
+understood by the `rubberband-sharp` code.
+
+If you make use of this interface, please ensure you comply with the
+terms of its licence, in addition to the GPL licence accompanying
+Rubber Band Library itself:
+
+```
+[files in rubberband-dll and rubberband-sharp]
+
+Copyright 2018-2019 Jonathan Gilbert
+
+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 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.
+
+Except as contained in this notice, the name of Jonathan Gilbert
+shall not be used in advertising or otherwise to promote the sale,
+use or other dealings in this Software without prior written
+authorization.
+```