plugin to add a flow view

[张 龙涛]

hi, I want add a new plugin for digikam, but I don't has the premession  to create a PR. so I send here, if there has no problem, please help me.

The message about this PR is:

ref: https://bugs.kde.org/show_bug.cgi?id=448593
ref: https://github.com/cathaysia/digikamflowplugin

this plugin add a flow view for digikam. And It's almost functional.
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