Restore pom.xml for gerrit-plugin-gwtui

This artifact is required for GWT plugins. There is no BUCK build
for it yet and the pom.xml was accidentally deleted by dcee57212f.

Change-Id: Ib417fb3308135285248fb7a97ee3bdbba2e49089
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
1 file changed