chore: implement standardised PR template for project standards

[anaghwadhwa123]

Description

This PR introduces a formal GitHub Pull Request templated located in .github/pull_request_template.md. The goal of this change is to standardise the contribution workflow across the doubtfire-astro repository, ensuring that all code and documentation updates meet our professional open-source and project standards.

Key improvements:

• Added a dedicated section to link Microsoft Planner cards, ensuring every code change is mapped to an authorised project task.
• Included a specific checklist item for updating the lastUpdated and author frontmatter in Markdown files, supporting our initiative for better documentation tracking.
• Integrated a multi-browser testing checklist (Chrome, Safari, Firefox) to ensure UI consistency across the platform.
• Formalised the requirement to request reviews from other peers, fulfilling our project standards.

Type of change

• Documentation (update or new)

How Has This Been Tested?

• Used the VS Code Markdown Preview (Ctrl+Shift+V) to confirm that all checkboxes, headers, and comment blocks render correctly according to GitHub Flavoured Markdown (GFM) standards.
• Confirmed the file is located in the .github/ root directory, which is the required convention for GitHub to automatically detect and apply the template to new Pull Requests.
• Manually verified that the [ ] syntax correctly generates interactive checkboxes that can be toggled once the PR is live.
• Performed a local git status and diff to ensure no unintended files were modified and that the file permissions are correct for the repository.

Testing Checklist

• Tested in latest Chrome
• Tested in latest Safari
• Tested in latest Firefox

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have requested a review from ... on the Pull Request

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[jmirchh75]

Good changes, will help with new contributors submitting a PR for the first time too. Document looks cleaner and easier to read too, and additions in the checklist are useful.

[Roeenk27]

Good stuff, a proper PR template was definitely needed, and this one covers the right bases. The Planner card and frontmatter checklist items are nice touches.