update: pr template

Author: olivmath

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -1,16 +1,23 @@
 # ❤️ Thanks for adding a leaf to our tree! 🌳
 
-<!-- # ✅ Done for review -->
+<!-- # ✅ Done for review #<NUMBER OF ISSUE>-->
 
 ## Before submitting this PR, please make sure that:
 
 - [ ] Your code is running WITHOUT ERRORS or WARNINGS
 - [ ] You have added TEST to your code
+- [ ] Link this PR with Issue, if applicable
 
 ## Describe your changes
 
 A clear and concise description of what you want
 
 ## Show how to use your feature!
 
+```python
+import merkly
+
+print(merkly)
+```
+
 # Welcome to the Merkly Community! 🌱