Add DID Card Minting Function with Custom Event Logging

[mhraju069]

Summary

This PR adds a Mint function that allows users to mint DID Cards for employees. It also includes a mintLog event that logs the sender, custom message,name,Id and timestamp.

Changes Introduced

• Created Mint() function in Solidity
• Added mintLog event to emit sender, message, name, and timestamp
• Frontend integrated with the contract using ethers.js
  • Connected wallet via MetaMask
  • Set up contract instance
  • Placeholder for event listening or transaction response

Why?

To enable users to mint identity cards on-chain with clear audit logs for transparency and traceability.

Next Steps

• Integrate UI form for user inputs (name)
• Listen for mintLog events and display in UI
• Add verification and access control
• show candidates data in ui

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Let me know if this needs to be customized further (e.g. includes frontend, test cases, etc.).