.NET Core 3.1.0

.NET Core 3.1.0 is available and https://github.com/dotnet/core/issues/3950 has been opened for discussion.

[Release Notes](https://github.com/dotnet/core/blob/master/release-notes/3.1/3.1.0/3.1.0.md)
[Download](https://dotnet.microsoft.com/download/dotnet-core/3.1)

**Blog posts**

[.NET Core](https://devblogs.microsoft.com/dotnet/announcing-net-core-3-1/)
[ASP.NET Core](https://devblogs.microsoft.com/aspnet/asp-net-core-updates-in-net-core-3-1/)

Please report any issues you find with .NET Core 3.1 , either responding to this issue, creating a new issue or creating a new issue in one of the following repos:

* [aspnet/Home](https://github.com/aspnet/Home) - for ASP.NET Core questions
* [aspnet/EntityFrameworkCore](https://github.com/aspnet/EntityFrameworkCore) - for Entity Framework Core questions
* [dotnet/cli](https://github.com/dotnet/cli/issues) - for CLI tools and questions
* [dotnet/corefx](https://github.com/dotnet/corefx/issues) - for API issues and questions
* [dotnet/coreclr](https://github.com/dotnet/coreclr/issues) - for runtime issues
* [dotnet/core-setup](https://github.com/dotnet/core-setup/issues) - for installer issues
* [dotnet/winforms](https://github.com/dotnet/winforms/issues) - for Winforms issues
* [dotnet/wpf](https://github.com/dotnet/wpf/issues) - for WPF issues
* [nuget/home](https://github.com/nuget/home/issues) - for NuGet questions and issues

Start with the linked .NET Core 3.1.0 release notes and the discussion in dotnet/core issue 3950. This issue is an announcement and names no file, test, or implementation task, so there is no concrete completion condition to verify.

Written by the indexing model from the issue text.