chore: add PR template

Author: raz-w-20230331

.github/pull_request_template.md

@@ -0,0 +1,19 @@
+## 📄 Description
+Briefly describe the purpose of this PR. Include context and what it solves.
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+
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+## 🧠 Rationale
+Explain the motivation and necessity of the change. Why was this needed? What problem does it solve?
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+
+
+## 🧪 Example / Testing
+If applicable, provide test scenarios, CLI commands, or example contract interactions.
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+## 🧬 Changes Summary
+Notable changes:
+* add each change in a bullet point here
+* ...