add readme to package

Author: jogibear9988

src/Migrator/DotNetProjects.Migrator.csproj

@@ -20,6 +20,10 @@
     <FileVersion>9.0.0.0</FileVersion>
     <Version>9.0.0.0</Version>
   </PropertyGroup>
+
+  <ItemGroup>
+    <None Include="..\..\README.md" Link="README.md" Pack="true" PackagePath="\" />
+  </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" /> 
   </ItemGroup>