Description

This is basic ER relationship diagram that is based on UML diagram. It's dependent on MermaidJS

Fixes #19

Type of change

Please delete options that are not relevant.

new features
this change itself is documentation that developers refer to construct the database

It has been tested locally and on live editor. A link is included to help the developer replicate the same test

Test Configuration: N/A

[x] My code follows the style guidelines of this project
[x] I have performed a self-review of my own code
[x] I have commented on my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[N/A] My changes generate no new warnings
[N/A] I have added tests that prove my fix is effective or that my feature works
[N/A] New and existing unit tests pass locally with my changes
[N/A] Any dependent changes have been merged and published in downstream modules