Add .github folder with issue and pull request templates

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What does this PR do?

This pull request adds the .github folder with issue and pull request templates as requested in the raised issue.

Summary

This PR adds standardized templates for reporting issues and creating pull requests for uniformity.

Description of Changes

• Added .github folder to the repository root directory.
• Added ISSUE_TEMPLATE subfolder and PULL_REQUEST_TEMPLATE.md.
• Added bug_report.md and feature_request.md files to the ISSUE_TEMPLATE folder.

Additional Information

The inclusion of these templates will provide clear guidelines for contributors when reporting issues and creating pull requests, making it easier for both contributors and maintainers to understand and address contributions promptly.

Before Submitting

• [x] This PR addresses issue #19.
• [x] Have you read the contributor guidelines and the Pull Request section?
• [x] This change was discussed and approved through the raised issue.
• [x] No specific tests are necessary for the changes made.

Who can review?

@ylacombe OR @sanchit-gandhi

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Have you read the contributor guidelines and the Pull Request section?

Oh, with regards to the above, do let me know if the contributor.md files can be added as well. Thanks.

Edit: Tagging for review check. @ylacombe

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Just revisiting my open PRs (from my profile). Hope the PR is fine.