An extension for colcon-core to act as a template for new extensions.
When using this template, be sure to replace all instances of the word "template" in the repository:
$ find * -type f | xargs sed -i 's/template-package/colcon-package-name/g'
$ find * -type f | xargs sed -i 's/template_package/colcon_package_name/g'
$ mv template_package colcon_package_name
$ grep -iR template *