RFR: Add jextract guide [v5]

Tue Apr 16 01:23:01 UTC 2024

On Mon, 15 Apr 2024 23:51:35 GMT, Nir Lisker <nlisker at openjdk.org> wrote:

>> I would mentioned that. After all, this tool is meant to save Java developers from knowing the intricacies of the native language.
>
> Was this resolved? I don't see a clarification (maybe I'm missing it).

I put this:

We can call this function from Java as follows (assuming this function is also exported
through the header files passed to jextract)

-------------

PR Review Comment: https://git.openjdk.org/jextract/pull/231#discussion_r1566596144