add some examples for Sub Group and Project Name

close #192

close #176 #178 #179 #190 #177 #174

Adding container URL to each document
Change relative url to absolute URL in get_document_details
Clean up a bit

allows you to fetch more infos about a document. e.g.: Abstract

Ff victims

See merge request !3

also some dates for old meetings could not be parsed, I also fixed it.
Add an example on how to find a list of people who contributed to
specific standard (based on the title of the input doc)

Add requirements file

See merge request !2

Ballot

See merge request !1

implement parsing of meetings and input documents
Close #175 #173 #182 #189