Implement QR Code Generation Feature

[KitanoB]

📱 Issue Title: Implement QR Code Generation Feature

### Description:
To enhance the usability and functionality of our tool, we aim to introduce a QR code generation feature. Users should be able to generate QR codes for their public keys seamlessly, making sharing and scanning more efficient.

Tasks:

🔍 Research Libraries/Tools: Identify and choose a reliable QR code generation library or tool that's compatible with our tech stack. Some popular options are ZXing and ZBar.
🛠 Integration: Integrate the chosen library/tool into our application, ensuring it can accurately encode public keys into QR codes.
💡 User Instructions: Provide clear instructions and documentation on how to use the QR code generation feature.
🧪 Testing: Write unit and integration tests to verify the accuracy and reliability of the generated QR codes.

Acceptance Criteria:

QR code generation is seamlessly integrated into the tool.
Generated QR codes accurately represent the provided public keys.
Users can easily view, save, and share the generated QR codes.
The feature is well-documented and easy for users to understand.
Tests confirm the reliability and correctness of the feature.