To install the templates:

sudo add-apt-repository ppa:quickly-templates-hackers/quickly-community-templates-daily
sudo apt-get update
sudo apt-get install quickly-ubuntu-qt-template

To use the templates:

HTML app: quickly create ubuntu-html-app
Qt app: quickly create ubuntu-qt-application
Qt Quick app: quickly create ubuntu-qtquick-application
Unity lens: quickly create unity-lens

To create a new template:
http://askubuntu.com/questions/136850/how-to-create-a-new-quickly-application-template