RFR: 7903128: Overhaul jextract README [v3]

[Jorn Vernee]

On Thu, 24 Mar 2022 14:06:37 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

>> I've improved the README file, by putting the expanding the build section, and putting it more front and center.
>> I have also streamlined the remaining contents a little, and removed the parts that were describing the foreign API (not really needed here).
>
> Maurizio Cimadamore has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Update README.md
>    
>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>
>  - Update README.md
>    
>    Co-authored-by: Jorn Vernee <JornVernee at users.noreply.github.com>

Marked as reviewed by jvernee (no project role).

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PR: https://git.openjdk.java.net/jextract/pull/3