Adds section of metadata to change view left panel using change-metadata-item extension point, which is located on the bottom of the change view left panel.
There is nothing to build, just copy the gerrit-change-metadataItem.html into the Gerrit's /plugins directory. There is no need to restart anything, once the file gets copied, Gerrit will detect the new PolyGerrit plugin after a few moments and will use it transparently.