Add Contact section on README

[isabelcosta]

Description

As a contributor,
I need to know where I can reach out to the community,
so that I can discuss or see discussions of this project.

I would suggest adding a section such as "Contact us" or "How to reach us" to the README.
An example is what is on mentorship-backend README.

Acceptance Criteria

Update [Required]

• Add contact section with AnitaB.org Open Source Zulip link and #powerup stream link.

Definition of Done

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

Estimation

1 hour

[AjayThakur12]

@isabelcosta please assign it to me

[isabelcosta]

@AjayThakur12 you can work on this :) I will assign this to you.

[sunjunkie]

@AjayThakur12 You need to submit a pull request on this repository. See https://help.github.com/en/desktop/contributing-to-projects/creating-a-pull-request.