Add PR template

Author: jarda-svoboda

.github/pull_request_template.md

@@ -0,0 +1,43 @@
+## What
+
+<!-- Brief description of the changes made -->
+
+## Why
+
+<!-- Explanation of why this change is needed. Link to related issues if applicable. -->
+
+Fixes #
+Relates to #
+
+## How
+
+<!-- How you implemented the changes (if the approach is complex or non-obvious) -->
+
+## Testing
+
+<!-- How you tested the changes. Include test scenarios and results. -->
+
+## Checklist
+
+Before submitting this PR, please ensure:
+
+- [ ] **Tests pass locally** (`npm test`)
+- [ ] **Linter passes** (`npm run lint`)
+- [ ] **Build succeeds** (`npm run build`)
+- [ ] **All commits are atomic** (each commit works independently)
+- [ ] **Commits have clear messages** (imperative mood, descriptive)
+- [ ] **Branch rebased on latest master** (`git rebase origin/master`)
+- [ ] **Documentation updated** (if API or behavior changed)
+- [ ] **Examples updated** (if adding new features)
+
+## Additional Notes
+
+<!-- Any additional information that reviewers should know -->
+
+---
+
+<!-- 
+Please read our Contributing Guide before submitting:
+https://github.com/sveltekit-i18n/lib/blob/master/CONTRIBUTING.md
+-->
+