Add Git Workflow Guide

[Abd-Standard]

Description

Document the preferred Git branching strategy and pull request workflow for contributors.

Acceptance Criteria
Workflow is documented.
Branch naming examples are included.
PR process is explained.

[ajulaybeeb]

@ajulaybeeb has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hi Maintainer, haven reviewed the description of the issue, and well experienced with Js Library,
I would like to hop on the issue and sure to deliver at ETA 2hrs

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ajulaybeeb to this issue.