Update PULL_REQUEST_TEMPLATE.md

[Burhan-Q]

Draft idea for a new PR template per conversation on Slack. @glenn-jocher please let me know if there are any changes you'd like to make or if you prefer to keep with the current iteration. Curious for input from @AyushExel @kalenmike @Laughing-q and @RizwanMunawar as well.

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Additions

• Adds commented instructions and header

<!--
Thank you 🙏 for your contribution to Ultralytics 🚀! Your effort in enhancing our repositories is greatly 
appreciated. To streamline the process and assist us in integrating your Pull Request (PR) effectively, fill out 
all relevant sections.
-->

• Provides sections for users to provide relevant information in an organized manner
• Includes Checklist section of items to complete for each PR
• Add optional sections for media and performance/test results

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

📊 Key Changes

• The PR template has undergone a substantial expansion from 4 main points to a more detailed checklist, tips, and sections for bug fixes and feature additions.
• New sections include "Summary of Changes," "Link Issues," "Relevant Discussions," "Rationale/Justification," "Checklist," "Known/lingering Problems," "Relevant media," and "Results."

🎯 Purpose & Impact

• The updated template aims to guide contributors to provide more thorough information with their PRs, ensuring each submission is unique and well-justified.
• Improvements can result in higher quality contributions, easier maintenance, and more efficient PR review processes, benefiting developers and enhancing the software for users. 🌟

🌟 Summary

"Update to PR template to foster comprehensive and informed submissions, promoting project clarity and quality."

[Burhan-Q]

Reference for the highlighted block sections

Block Highlight Previews

Note

Highlights information that users should take into account, even when skimming.

Tip

Optional information to help a user be more successful.

Important

Crucial information necessary for users to succeed.

Warning

Critical content demanding immediate user attention due to potential risks.

Caution

Negative potential consequences of an action.

[Burhan-Q]

Added sub-section for linking Community Discussions as recommend by @RizwanMunawar

[glenn-jocher]

@Burhan-Q thanks for the effort here, I've just merged a super simple PR to comment the guidance as it's extra work to delete this and many people just never submit any written summary.

This should combine with our new PR summaries soon that should help automate understanding and review of PRs.

[glenn-jocher]

Reference for the highlighted block sections

Block Highlight Previews

Note

Highlights information that users should take into account, even when skimming.

Tip

Optional information to help a user be more successful.

Important

Crucial information necessary for users to succeed.

Warning

Critical content demanding immediate user attention due to potential risks.

Caution

Negative potential consequences of an action.

Very cool, did not know!