docs(repo): add standardized Pull Request template

Author: bsayli

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,63 @@
+# 🧩 Pull Request Template
+
+Thank you for contributing to **spring-boot-openapi-generics-clients**! 🙌
+Please review the checklist and provide context to help maintainers review efficiently.
+
+---
+
+## 🎯 Summary
+
+> Short description of what this PR does and *why* — one paragraph max.
+
+Example:
+
+> Implements the cleanup described in issue [#9](https://github.com/bsayli/spring-boot-openapi-generics-clients/issues/9), removing redundant DTOs and refining client generation.
+
+---
+
+## 📦 Changes
+
+List key changes briefly (add/remove/modify):
+
+* Added / removed / refactored modules or files
+* Updated docs or configuration
+* Improved client generation logic
+* Fixed envelope or schema alignment
+
+---
+
+## 🧠 Outcome / Impact
+
+Explain the impact:
+
+* Cleaner or smaller generated output
+* Improved readability or maintainability
+* Aligned server–client contract
+* Enhanced CI or test coverage
+
+---
+
+## ✅ Checklist
+
+* [ ] Scope is minimal and focused
+* [ ] Build passes locally: `mvn -q -ntp clean verify`
+* [ ] Tests added/updated where appropriate
+* [ ] Docs updated (`README.md`, `docs/`, or `adoption guides`)
+* [ ] No accidental changes in generated code outside overlays
+* [ ] Linked issue (e.g., `Closes #9`)
+
+---
+
+## 🧾 Metadata
+
+**Type:** `feature` / `bugfix` / `docs` / `refactor` / `chore` / `test` / `ci`
+**Related Issue:** (optional) `#issue-number`
+**Target Release:** (optional) e.g. `v0.7.3`
+
+---
+
+> 💡 *Tip:* Keep PR titles short but meaningful — for example:
+>
+> * `feature(client): add envelope auto-registration`
+> * `bugfix(server): fix schema drift on nested generics`
+> * `docs(repo): improve contributor setup guide`