feat: add pull request template for consistent contributions

.github/PULL_REQUEST_TEMPLATE.md

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+<!---
+☝️ Please ensure the PR title adheres to commit conventions (https://conventionalcommits.org)
+-->
+
+### 🔗 Issue Reference
+
+<!-- If this PR is linked to an existing issue, mention it here, e.g., "Fixes #123" -->
+
+### ⚙️ Change Category
+
+<!-- Select the nature of your changes by placing an `x` in the relevant boxes below. -->
+
+- [ ] 📚 Docs Update (changes to documentation or README files)
+- [ ] 🐞 Bug Patch (non-breaking fix for a reported issue)
+- [ ] 🚀 Enhancement (modifications that improve existing functionality)
+- [ ] 🌟 New Feature (a non-breaking addition of new functionality)
+- [ ] 🛠 Maintenance (updates to build processes or project tooling)
+- [ ] 🔧 Major Update (a change that impacts existing functionality)
+
+### 📝 Summary of Changes
+
+<!-- Describe your updates thoroughly -->
+<!-- Why was this modification necessary? What issue does it resolve? -->
+
+### ☑️ Checklist
+
+<!-- Mark completed tasks with an `x` -->
+<!-- If this change requires updated documentation, please link it -->
+<!-- If you're unsure about any item, feel free to ask; we're here to help! -->
+
+- [ ] Linked to an issue or relevant discussion.
+- [ ] Updated necessary documentation to reflect the changes.