README for doc-script

[flaminghakama]

In order that people other than Urs can help work on the doc-script that generates the HTML documentation for snippets, we need some kind of README file that explains how it works.

What is currently known (from email):

The oll.py contains the logic of parsing and managing the openlilylib files, while html.py contains the code to generate the HTML.

[uliska]

Before that makes sense it has to be reconsidered if the scripts shouldn't be redone completely. They were started for a previous attempt to restructure the library.

Probably much of it can be reused but I think we first should have a fundamental discussion about a library and API documentation system - which is part of the current approach for a new, integrated openLilyLib.

[uliska]

Moved to new issue #61