Updated READMEs

[Cornelius Schumacher]

I pushed updates to the READMEs, which complete the basic information with at 
least initial content. Aurélien reviewed the changes. The format of the 
REAMDEs is described in the Wiki [1].

One of the motivation behind these changes was to get all information ready to 
be parsed for Inqlude, so that we can include all frameworks there, and don't 
have to maintain the data twice.

For that I had to add two additional fields. One is a one-line summary at the 
top of the file. The other one is the home page. For now I put the main page 
on projects.kde.org for each framework there. We might want to use some more 
welcoming page there in the future, though.

[1]: 
https://community.kde.org/Frameworks/Epics/KF5.0_Release_Preparation/Necessary_Files

-- 
Cornelius Schumacher <schumacher at kde.org>