Adding Kirigami Gallery to kde-sdk

[Marco Martin]

Hi all,
in the kirigami framework repo, there is a little gallery application which 
outgrew the point of being a small example.
It's now becoming a tutorial app: on each page an example and documentation on 
how to use a particular component and when with links on the relevant source 
code and HIG page about  such component (if available) becoming a developing 
aide while writing a Kirigami application.

Also, since it's planned to add more graphics and heavy media files, makes it 
not particularly ideal to still use the framework repository.
If no objections, it will be moved as a standalone repo as part of kde-sdk as 
developing aide.

-- 
Marco Martin