chore: add pull request template

[BobbieGoede]

🔗 Linked issue

❓ Type of change

• 📖 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

Adds a PR template (I took it from Nuxt) that looks like this, we use it for @nuxtjs/i18n as well. It makes it easier for maintainers to read and guides contributors in providing good information.

Tagging @cpreston321 / @Tahul for review.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.

[cpreston321]

LGTM

[Tahul]

Great; thanks a lot!