Update README.md

Author: MarcusDavidG

README.md

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 Soroban smart contract powering the Sharpy split payment protocol on Stellar. Handles invoice creation, multi-recipient fund distribution, escrow management, recurring billing, and agentic payment integration.
 
-<img width="767" height="354" alt="sharpy" src="https://github.com/user-attachments/assets/8ac67307-2b20-47a8-a405-2771e6c6dc07" />
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