Addition of pr create automate message

[Soumyosish]

Add Automated PR Comment on Pull Request Creation

Description
Set up a GitHub Actions workflow that automatically posts a welcome/checklist comment when a new pull request is created. This helps contributors know exactly what needs to be checked and ensures consistent PR quality.

What Needs to Be Done

1. Create a new workflow file: .github/workflows/pr-welcome.yml
2. The workflow should trigger on pull_request events (type: opened)
3. Post an automated comment with:
   • Welcome message thanking the contributor
   • PR checklist reminders (self-review, tests, screenshots for UI changes)
   • DSCWoC label reminders (dscwoc + difficulty label required)
   • Link to contribution guidelines

Example Workflow

name: PR Welcome Comment
on:
  pull_request:
    types: [opened]
jobs:
  comment:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.payload.pull_request.number,
              body: "Thank you for your contribution! Please ensure..."
            });

Files to Create

• .github/workflows/pr-welcome.yml

Acceptance Criteria

• Automated comment posted on every new PR
• Comment includes PR checklist and guidelines
• References DSCWoC label requirements
• Does not trigger on PR updates (only on open)