RFR: Initial section on testing [v5]

[Jesper Wilhelmsson]

On Mon, 19 Oct 2020 21:28:32 GMT, Igor Ignatyev <iignatyev at openjdk.org> wrote:

>> Ok. The text has been updated to include this information.
>
> Although you updated Gtest's introduction paragraph to reflect that as of now gtest is for hotspot only, I think it
> needs to be said here as well.
>> The Google Test (GTest) framework is intended for unit testing of the C++ native code.
> 
> this statement can also create an inadequate impression that you can't/shouldn't test native code w/ jtreg, this isn't
> the case as one can a) test native code thru java API; b) use native test code in jtreg tests.
> btw, point b) might deserve a sentence or two in JTreg section of this document.

Please provide a sentence or two about b). Or maybe add that as a separate change so that you get proper credit for it
and can become a Committer soon :-)

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PR: https://git.openjdk.java.net/guide/pull/30