feature: document which C++ standard versions the TS implementation support.

[lukka]

Did you check the tree-sitter docs?

• I have read all the tree-sitter docs if it relates to using the parser

Is your feature request related to a problem? Please describe.

It would be helpful to document what C++ Standard Version this TreeSitter implementation is supposed to work with, e.g. C++20, C++23

Describe the solution you'd like

It would be nice if the documentation stated what version of the C++ Language Standard are supported. For example, is C++17 or C++20 supported?

Also, if any specific feature is not supported, it would be nice it would be documented as well. For example, the C++20 modules are not supported, as requested here: #174

Describe alternatives you've considered

Looking and trying to find out myself is time expensive.

Additional context

No response