Implementation of instruction to use PostgreSQL in the application

[Aryan-CC]

Purpose

As the application supports both MySQL and PostgreSQL Database options, added instructions for usage of PostgresSQL.

Does this introduce a breaking change?

[ ] Yes
[x ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ x] Documentation content changes
[ ] Other... Please describe:

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[sonwan2020]

I think we'd better and children pages here

[sonwan2020]

to reduce duplicated configuration, we should not copy all content of the yaml

[sonwan2020]

upper case? this variable is defined in 0203.md

[sonwan2020]

It is not a good idea to add new lab for postgres sql

Seems the configuration differences are minor for MySQL & PostgresSQL, I think we may replace MySQL with PostgresSQL in the main thread, and use a Optional page to describe the differences for MySQL

[sonwan2020]

Too much redundant changes, we may use a more straight way