chore(github): add PR template (#52)

Author: caugner

.github/PULL_REQUEST_TEMPLATE

@@ -0,0 +1,19 @@
+<!-- 🙌 Thanks for contributing! Adding details below will help us to merge your PR faster. -->
+
+### Description
+
+<!-- ✍️ Summarize your changes in one or two sentences -->
+
+### Motivation
+
+<!-- ❓ Why are you making these changes and how do they help? -->
+
+### Additional details
+
+<!-- 🔗 Link to documentation, bug trackers, source control, or other places providing more context -->
+
+### Related issues and pull requests
+
+<!-- 🔨 If this fully resolves a GitHub issue, use "Fixes #123" -->
+<!-- 👉 Highlight related pull requests using "Relates to #123" -->
+<!-- ❗ If another pull request should be merged first, use "**Depends on:** #123" -->