docs: Change in the Setup for developers (Unix)

[ashwinijha6]

Description

As a developer,
I want to change certain prompts in the 7th Step of Setup for developers (Unix) in the README.md,
so that a new user can apply it correctly for the setup.

Mocks

Acceptance Criteria

Update

• In the 7th step of Setup for developers (Unix) that is create the systersdb includes $psql after the psql command the remaining commands could have a postgres=# or the systersdb=# prompt as per the database instead of the shell prompt as shown in the screenshot.
• also \q & exit could be added to the commands

Definition of Done

• All of the required items are completed.
• Approval by 1 mentor.

Estimation

1-2 hours

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[ashwinijha6]

@SanketDG could u pls assign me this issue so that I can make the required changes

[ashwinijha6]

@gaurivn & @sakshi1499 could u'll pls triage this issue & assign it to me?