DOCS/client_api_examples: add an alternative qml example

This one avoids use of a FBO. It's less flexible, because it uses works
around the whole QML rendering API. It seems to be the only way to get
OpenGL rendering without any indirections, though.

Parts of this example were insipired by Qt's "Squircle" example.

Also add a README file with a short description of each example, to
reduce the initial confusing.

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