Create pull_request_template.md

.github/pull_request_template.md

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+# Pull Request Template
+
+## Description
+Briefly describe the changes this PR introduces.
+
+## Changes
+
+### Previous Behavior
+*Describe how the code behaved before this change.*
+
+### Root Cause
+*Explain the core reason behind the erroneous/old behavior (e.g., bug, design flaw, missing edge case).*
+
+### New Behavior
+*Describe how the code behaves after this change.*
+
+### Fix Implementation
+*Detail exactly how the issue was resolved (specific code changes, algorithms, logic flows).*
+
+## Related Issues
+- Fixes #[issue-number]
+- Related to #[issue-number]