Add Nuget package for managed (.NET) projects

Signed-off-by: Maxime Gervais <[email protected]>

Project/Nuget/Wrapper/MediaInfoLib.Wrapper.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <RootNamespace>MediaInfoLib.Wrapper</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Include="..\..\..\Source\MediaInfoDLL\MediaInfoDLL.cs" Link="MediaInfoDLL.cs" />
+  </ItemGroup>
+
+</Project>

Project/Nuget/Wrapper/MediaInfoLib.Wrapper.nuspec

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+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
+  <metadata>
+    <id>MediaInfoLib.Wrapper</id>
+    <version>18.8.1</version>
+    <title>MediaInfoLib DLL wrapper for .NET projects</title>
+    <authors>MediaArea.net</authors>
+    <owners>MediaArea.net</owners>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <licenseUrl>https://github.com/MediaArea/MediaInfoLib/blob/master/LICENSE</licenseUrl>
+    <projectUrl>https://mediaarea.net/MediaInfo</projectUrl>
+    <iconUrl>https://mediaarea.net/_/img/MediaInfo_90x90.png</iconUrl>
+    <description>MediaInfo is a convenient unified display of the most relevant technical and tag data for video and audio files.</description>
+    <copyright>Copyright (c) MediaArea.net SARL.</copyright>
+    <language>en-US</language>
+    <tags>mediainfo mediainfolib libmediainfo</tags>
+    <dependencies>
+      <group targetFramework=".NETStandard2.0" />
+    </dependencies>
+  </metadata>
+</package>