hg: build-infra/jdk9: Add temporary files to the build infra project. These are not supposed to be integrated into mainline.

[magnus.ihse.bursie at oracle.com]

Changeset: 628448e52e8c
Author:    ihse
Date:      2016-02-12 11:01 +0100
URL:       http://hg.openjdk.java.net/build-infra/jdk9/rev/628448e52e8c

Add temporary files to the build infra project. These are not supposed to be integrated into mainline.

+ support/new-hotspot-build.html
+ support/new-hotspot-build.md
+ support/update-build-readme.sh