0.Readme.txt: Improved asciidoc formatting.
0.Readme.txt: Improved asciidoc formatting.

The formatting of the Readme file was close to asciidoc, but needed some
tweaking.  The result is a bit of a compromise, but not too bad.

These changes were tested using the asciidoc formatting tool to produce
HTML output.  The results looked fairly good.

manuella/Carnaval,ubiqx-org/Carnaval