chore(ci): add GitHub PR template (#254)

.github/pull_request_template.md

@@ -0,0 +1,23 @@
+<!---
+☝️ PR title should follow conventional commits (https://conventionalcommits.org)
+-->
+
+### 🔗 Linked issue
+
+<!-- If it resolves an open issue, please link the issue here. For example "Resolves #123" -->
+
+### ❓ Type of change
+
+<!-- What types of changes does your code introduce? Put an `x` in all the boxes that apply. -->
+
+- [ ] 📖 Documentation (updates to the documentation or readme)
+- [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
+- [ ] 👌 Enhancement (improving an existing functionality)
+- [ ] ✨ New feature (a non-breaking change that adds functionality)
+- [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
+- [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
+
+### 📚 Description
+
+<!-- Describe your changes in detail -->
+<!-- Why is this change required? What problem does it solve? -->