docs: create pr_template.md

.github/pr_template.md

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+<!--
+  Thank you for submitting a PR! 
+  Please fill out all sections below to help us understand your changes.
+-->
+
+### Why
+<!-- 
+  1. Why is this change necessary?
+  2. What problem does it solve or improve?
+  3. Link to any relevant issues, if applicable.
+-->
+_Enter your explanation here._
+
+### How
+<!--
+  1. How did you implement this?
+  2. Outline the approach or steps taken.
+  3. List any resources or documentation that helped you.
+-->
+_Enter the implementation details here._
+
+### Additional Notes (Optional)
+<!--
+  Use this space for additional considerations: 
+  - Potential side effects
+  - Dependencies 
+  - Testing instructions
+  - Anything else reviewers should know
+-->
+_Any extra info here._