README.md outdated list of supported built-in types #2266

Bug description

The list of built-in supported types in README.md is outdated or at least ambiguous.

Repro steps

Read the README.md, see no mention of DateOnly or TimeOnly.

Expected behavior

Reading README.md is enough to know what built-in (or otherwise) types are supported out of the box.

My rationale is that DateOnly and TimeOnly should be explicitly listed same way as the other date/time types at the moment,

Alternatively the phrasing could be made in broader terms like "Date/time types (TimeSpan, DateTime, DateTimeOffset, etc.)", but I don't think that helps the reader.

Actual behavior

Have to rummage through old release notes, issues, pull request, or code to find out what exact built-in types are supported.

Additional context

I was mainly trying to find out if DateOnly and TimeOnly were supported. There are probably other types that could use explicit mention, especially if they have been introduced in newer .NET versions.

Some serialization libraries do not support newer types, so in general it is sometimes unclear whether documentation is lacking or actual type is unsupported.

PS: Thanks for all the hard work maintaining the library. 😊