RFR: Add section on pre-built binaries to README

[Maurizio Cimadamore]

On Fri, 7 Oct 2022 11:43:36 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> I've added a short section on where to find the pre-built binaries. I think building jextract is less important than the information on usage if people can get binaries, so I've moved the section on building and testing to the bottom.

README.md line 7:

> 5: ### Getting jextract
> 6: 
> 7: Pre-built binaries for jextract are periodically released here: [https://jdk.java.net/jextract](https://jdk.java.net/jextract). These binaries are built from the `master` branch of this repo, and generally target the foreign memory access and function API in the latest mainline JDK (for which binaries can also be found on [jdk.java.net](https://jdk.java.net)).

Suggestion:

Pre-built binaries for jextract are periodically released [here](https://jdk.java.net/jextract). These binaries are built from the `master` branch of this repo, and target the foreign memory access and function API in the latest mainline JDK (for which binaries can be found [here](https://jdk.java.net)).

README.md line 9:

> 7: Pre-built binaries for jextract are periodically released here: [https://jdk.java.net/jextract](https://jdk.java.net/jextract). These binaries are built from the `master` branch of this repo, and generally target the foreign memory access and function API in the latest mainline JDK (for which binaries can also be found on [jdk.java.net](https://jdk.java.net)).
> 8: 
> 9: For getting a jextract version with all the latest updates and fixes, see the section on [building](#building--testing).

Suggestion:

Alternatively, to build jextract from the latest sources (which include all the latest updates and fixes) please refer to the [building](#building--testing) section below.

README.md line 186:

> 184: ```
> 185: 
> 186: Note however that running `jtreg` task requires `cmake` to be available on the `PATH`.

Suggestion:

Note: running `jtreg` task requires `cmake` to be available on the `PATH`.

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PR: https://git.openjdk.org/jextract/pull/84