Publish "Calqlatr" to the App and Play stores

The plan is to publish the "calqlatr" example to both stores and watch how it works. We want to make the experience with this process for Qt developers using Qt for cross-platform development as smooth as possible. So we watch for:

• Do docs explain and address all those steps sufficiently?
• What is the handling of various files specific to publishing if they are coming from a shared project (here from Qt examples) on git and need to be used only for publishing?
• How simple is the workflow with later updates?
• How much can we "hide" platform differences?

A nice side effect is that we get a simple nice app in the store which can really be used and demoed if needed