docs: add public API compatibility checklist (#449)

Author: Bilalishaq7

README.md

@@ -198,4 +198,6 @@ compatibility.
 import { PocketPay } from '@axionvera/pocketpay-sdk';
 const sdk = new PocketPay({ network: 'testnet' });
 
-==================================================
+==================================================
+## Public API Compatibility
+Before submitting changes to exported functions or types, review the [Public API Compatibility Checklist](docs/PUBLIC_API_COMPATIBILITY_CHECKLIST.md) to ensure backwards compatibility and proper migration guidance.

docs/PUBLIC_API_COMPATIBILITY_CHECKLIST.md

@@ -0,0 +1,12 @@
+# PocketPay SDK �� Public API Compatibility Checklist
+
+This checklist must be completed for any PR modifying poublicly exported functions, types, classes, or constants within the PocketPay SDK.
+
+---
+
+## 1. Exported Functions & Types Review
+
+- [ ]  *&Signature Stability:** Are function signatures, parameter orders, and return types preserved or
+  Strictly additive?
+- [ ]  *&Export Suficiency:** Are all new or
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