[Medium] Add Vaccination Verification contract

[Josie123-Dev]

Task Description

Create Vaccination Verification contract:

• Verify vaccination credentials
• Validate zero-knowledge proofs
• Check vaccination status
• Implement verification logic
• Emit verification events

Requirements

• Verification function
• ZK-proof validation
• Status checking
• Verification logic
• Event emission

Acceptance Criteria

• Verification works
• Proofs are validated
• Status is checked
• Logic is correct
• Events are emitted

[Arowolokehinde]

can i work on this issue? i have the neccessary expertise needed to work on this issue. i am a software developer with solid exprience in writing rust and typescript programs and working on this issue would give me more exposure to your codebase . i hope to learn more while contributing