docs: add workflow to assign PR to its author

[Anmol-Baranwal]

Description

name: "Author Assign PR"

on:
  pull_request_target:
    types: [opened, reopened]

permissions:
  pull-requests: write

jobs:
  assign-author:
    runs-on: ubuntu-latest
    steps:
      - uses: toshimaru/auto-author-assign@v1.6.2
        with:
          repo-token: "${{ secrets.GITHUB_TOKEN }}" # GITHUB_TOKEN will be used by default

Fixes Issue

Closes #448

Have you read the Contributing Guidelines on Pull Requests?

• [x] Yes
• [ ] No

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)

Checklist:

• [x] My code follows the style guidelines(Clean Code) of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I've edited the SCRIPTS.md and link to my code.
• [ ] I have created a helpful and easy to understand README.md
• [ ] My documentation follows Template for README.md
• [x] My changes generate no new warnings
• [ ] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works.

[Anmol-Baranwal]

@avinashkranjan

There is a error with the issue template, which I noticed right now.

I have fixed it, due to which issue templates will be visible again.