readme: renamed and converted in .md format for a better Github view

[robang74]

readme: renamed and converted in .md format for a better Github view

[pvuorela]

For the content, should still refer to qt5.

But overall almost all the content of the file seem way off even with the adjustments. The description is vague "user experiences" while could be something like "(wayland) home screen application for mobile devices". The acknowledgments and authors are something of distant past, updating or running is sailfish specific while not saying that, and in that context being obvious.

So thus thinking if the whole file should be just deleted or replaced with some simplified couple lines on being a home screen thingie.

[robang74]

Fine, whatever. Just to point out that it is the right time to take care of that file. :-)

[pvuorela]

Created #44 for simplified alternative

[pvuorela]

Merged the simplified alternative so closing this one. Thanks for bringing up the issue!