Added the feature to auto comment on pr merged

[suhanipaliwal]

Related Issue

Fixes #172

Description

I have added auto-comment-on-pr-merge.yml in .github/workflows directory. This file will add the feature of auto commenting when a pr is merged.

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Screenshots / videos (if applicable)

[Attach any relevant screenshots or videos demonstrating the changes]

Checklist:

• I have performed a self-review of my code
• I have read and followed the Contribution Guidelines.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have commented my code, particularly in hard-to-understand areas.

Additional context:

[Include any additional information or context that might be helpful for reviewers.]