Add contributing guidelines check reminder in pull request template

[Cjay-Cyber-2]

Description — what to implement and the why/impact.

Clear pull request instructions help contributors follow project conventions, such as linking issues, ensuring Zod validation, and maintaining TypeScript strictness. Adding or refining a pull request template standardizes PR submissions.

Context & Requirements — background, constraints, design references, edge cases;

grounded in the actual repo (real files, stack, conventions).

• GitHub templates reside in .github/pull_request_template.md (or .github/ISSUE_TEMPLATE/).
• Include checkboxes for running tests (npm test), building (npm run build), and referencing the closed issue.

Acceptance Criteria — a checklist ("- [ ] ...") of specific, testable conditions that define "done".

• Create or update .github/pull_request_template.md.
• Include reminders for tests, linting, and issue linking (Closes #...).

Implementation Guidance — likely files/modules to touch (use real paths from the repo context) and a suggested approach, without over-prescribing.

• Likely files: .github/pull_request_template.md

Testing & Validation — how the contributor should prove it works (tests to add/run, manual checks, screenshots for UI).

• Verify file existence and markdown formatting.

Submission Guidelines — must open a PR that includes "Closes #"; assignment is required before starting; follow the repo's existing style and conventions.

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Wave complexity: Trivial

[iorchirmyom-afk]

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‎I perfectly understand this issue. Please consider assigning me to it 🤲

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[FaithUwaoma]

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Please let me fix this for you ASAP.

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[okaforwisdom664-lgtm]

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[Mhidesav]

@Mhidesav has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hi
i would like to work on this issue please

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[daniel-atom]

@daniel-atom has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I can work on the issue

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[ademolacomfort]

@ademolacomfort has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

hi, I would like to work on this issue

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[vrse-vrde]

@vrse-vrde has applied to work on this issue as part of the Stellar Wave Program's 9th wave.

Hello maintainer, I’d like to work on this issue. Kindly assign to me

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@rupesh-kumar-sah's PR #498 was approved and merged by @Cjay-Cyber-2.

🏆 @rupesh-kumar-sah: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (280 total points). Track your full progress on GrantFox.

👏 Great work, @rupesh-kumar-sah! Keep contributing to mergepay.