chore: add pull request template

.github/pull_request_template.md

@@ -0,0 +1,16 @@
+## Checklist
+Make sure you have
+- [ ] Added relevant `@nestjs/swagger` decorators wherever required 
+- [ ] Added test cases (unit and integration) wherever required
+
+## Description
+*Describe the aim/objective of this PR*
+
+## Steps to test
+*Add steps to run and test teh desired changes*
+
+## References
+*Add relevant links and screenshots outlining the working status of this PR*
+
+## Demo
+*If relevant to your change, attach a screen recording showcasing that the change is working and giving desired results.*