Update PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,3 +1,5 @@
+Place link to the addressed issue here.
+
 ## What
 
 Describe what you have done in a human readable manner. For a detailed description use [CHANGELOG.md](https://github.com/acm-w-nitk/acm-w-nitk.github.io).
@@ -8,4 +10,8 @@ Describe your motivation. Link issues, discussions, etc.
 
 ## How
 
-Describe how you did it and why you did it like that. Don't copy paste your commit message, use more free form and try to look at it from maintainers point of view.
+Describe how you did it and why you did it like that. Don't copy paste your commit message, use more free form and try to look at it from maintainers point of view. 
+
+### Testing
+
+Don't forget to describe how to test your PR, step by step.