Themes of .NET: High-level plans for .NET 6

A few interesting points:

- The Simple Apps epic should greatly simplify writing tiny standalone programs. Feels like a natural evolution of the recent top-level statements feature: https://github.com/dotnet/core/issues/5473

- The "Improve inner-loop performance for .NET developers" theme. Looks like tons of perf-related PRs have already been submitted for this. https://github.com/dotnet/core/issues/5510

- AOT and trimming are getting a ton of investment

"Desktop developers can package, distribute, release, and update their applications to multiple desktop platforms and architectures ", cost XL https://github.com/dotnet/core/issues/5462