Write preliminary documentation for end user

[d_rol]

0.5 is only a milestone on the road to 1.0 and a technology preview. But it is already fully functional in some domains, so documentation should be prepared.

End user documentation should be started as soon as possible so that it can be reviewed and matured along the time. A complete handbook is not necessary for this release, but its table of content should be started, and some essential parts drafted.

[d_rol]

asciidoc should be used as source language, our beloved chief has decided.

[ali]

How far did we get on this?