Create pull_request_template.md (#425)

Author: zktony

.github/pull_request_template.md

@@ -0,0 +1,9 @@
+## Describe your changes
+
+## Issue ticket number and link
+
+## Checklist before requesting a review
+- [ ] I have performed a self-review of my code.
+- [ ] If it is a core feature, I have added thorough tests.
+- [ ] I removed all Clippy and Formatting Warnings. 
+- [ ] I added required Copyrights.