You can use the provided install.sh script to build and install the plugin.
For archlinux users there is a PKGBUILD in the AUR.
Alternatively if you just want to build the plugin:
$ mkdir -p build
$ cd build
$ cmake .. -DCMAKE_EXPORT_COMPILE_COMMANDS=1 -DCMAKE_INSTALL_PREFIX=`kf5-config --prefix` -DQT_PLUGIN_INSTALL_DIR=`kf5-config --qt-plugins`
$ make