chore(): add PR template (medusajs#13721)

* chore(): add PR template

* remove emojis

Author: willbouch

.github/pull_request_template.md

@@ -0,0 +1,47 @@
+## Summary
+
+**What** — What changes are introduced in this PR?
+
+*Please provide answer here*
+
+**Why** — Why are these changes relevant or necessary?  
+
+*Please provide answer here*
+
+**How** — How have these changes been implemented?
+
+*Please provide answer here*
+
+**Testing** — How have these changes been tested, or how can the reviewer test the feature?
+
+*Please provide answer here*
+
+---
+
+## Examples
+
+Provide examples or code snippets that demonstrate how this feature works, or how it can be used in practice.  
+This helps with documentation and ensures maintainers can quickly understand and verify the change.
+
+```ts
+// Example usage
+```
+
+---
+
+## Checklist
+
+Please ensure the following before requesting a review:
+
+- [ ] I have added a **changeset** for this PR
+    - Every non-breaking change should be marked as a **patch**
+    - To add a changeset, run `yarn changeset` and follow the prompts
+- [ ] The changes are covered by relevant **tests**
+- [ ] I have verified the code works as intended locally
+- [ ] I have linked the related issue(s) if applicable
+
+---
+
+## Additional Context
+
+Add any additional context, related issues, or references that might help the reviewer understand this PR.