[foreign-jextract] RFR: adding libgit2 sample.

[Maurizio Cimadamore]

On Wed, 27 May 2020 10:58:18 GMT, Athijegannathan Sundararajan <sundar at openjdk.org> wrote:

> GitClone.java is a simple Java program to clone a repo from Github.

Minor issue in text

doc/panama_jextract.md line 548:

> 547:     -Djava.library.path=${LIBGIT2_HOME}/build/ \
> 548:     GitClone.java $*
> 549: ```

GitClone vs GitMain in the source code - mismatch?

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PR: https://git.openjdk.java.net/panama-foreign/pull/182