docs: add template for PRs (#40)

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,23 @@
+## Hey, I just made a Pull Request!
+
+<!-- Please describe what you added or changed, and add a screenshot if applicable.
+     This helps us understand the change and review it faster. -->
+
+### Description
+
+<!--- Describe your changes in detail -->
+
+### Related Issue
+
+<!--- If this PR addresses an issue, please link to it. -->
+
+### Checklist
+
+- [ ] Code is formatted with `cargo fmt`
+- [ ] Code is linted with `cargo clippy`
+- [ ] Tests have been added or updated
+- [ ] Documentation has been updated (if applicable)
+
+### Additional Notes
+
+<!--- Any additional information that might be useful during the review process -->