feat: adds GitHub PR template

.github/PULL_REQUEST_TEMPLATE

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+<!-- ☝️ PR title should follow conventional commits (https://conventionalcommits.org) -->
+<!-- Thanks for taking the time to write this Pull Request! ❤️ -->
+
+### ❓ 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, readme or JSdoc annotations)
+- [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
+- [ ] 👌 Enhancement (improving an existing functionality like performance)
+- [ ] ✨ 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, Motivation and Context
+
+<!-- Describe your changes in detail -->
+<!-- Why is this change required? What problem does it solve? -->
+<!-- If it resolves an open issue, please link to the issue here. For example "Resolves #1337" -->
+
+### 🧪 How Has This Been Tested?
+
+<!-- Please describe in detail how you tested your changes. -->
+<!-- Include details of your testing environment, tests ran to see how -->
+<!-- your change affects other areas of the code, etc. -->
+
+### 📝 Checklist
+
+<!-- Put an `x` in all the boxes that apply. -->
+<!-- If your change requires a documentation PR, please link it appropriately -->
+<!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+
+- [ ] I have linked an issue or discussion.
+- [ ] I have updated the documentation accordingly.