Create data structure

[DavielSA]

Create a markdown document with tables DB structure.

[DavielSA]

I have create all tables describes in this issue

[DavielSA]

Missing tables to define and create. I have edit description to add new tables

[DavielSA]

I have create all tables describes in this issue, and add content for test

[DavielSA]

pending review for @dailymp