Embed README in the NuGet package to show in the NuGet Gallery

[augustoproiete]

• Package readme on NuGet.org
• PackageReadmeFile
• Using .NET SDK 5.0.300+, you can add a http://README.md file to your package that will show on http://NuGet.org!
• Add a README to Your NuGet Package

[augustoproiete]

Adding the README to the package is currently blocked by https://github.com/NuGet/Home/issues/10791

It's currently not possible to use embedded PackageReadmeFile when using snupkg for symbols