docs(readme): link NOTICE.md at top for ERC-3643 vs ERC-1400 clarification

NOTICE.md at the top of README.md to clarify that ERC‑3643 is built on ERC‑20, not ERC‑1400. This ensures technical accuracy is immediately visible to all visitors without modifying historical documentation.

Author: afrail-inc

README.md

@@ -10,6 +10,8 @@
 
 Smart contract implementation for the **AFRX Security Token**, built on the [ERC-3643](https://tokeny.com/erc3643/) standard (ERC-20 base), incorporating enhanced compliance, upgradeability, and snapshot-based dividend distribution.
 
+> 📌 **Important Notice:** Please see [NOTICE.md](./NOTICE.md) for technical clarification on ERC‑3643 vs ERC‑1400.
+
 ## Project Links
 
 - [AFRXTokenV1_18.sol (Production Contract)](https://github.com/afrail-inc/afrx-security-token/blob/main/AFRXTokenV1_18.sol)