add Dropzone for neo4j credentials file

[dhiaaeddine16]

add Dropzone for neo4j credentials file:

reference: issue #3 ,

Key Benefits:

• Enhanced User Experience: The drag-and-drop functionality simplifies the process of uploading credentials, making it more intuitive and user-friendly.
• Improved Efficiency: By allowing direct file uploads, users can quickly provide necessary credentials without navigating through multiple input fields or settings.
• Reduced Errors: Automated file handling minimizes the risk of manual entry errors, ensuring that credentials are accurately processed.

example file:
NEO4J_URI=neo4j+s://*******
NEO4J_USERNAME=neo4j
NEO4J_PASSWORD=*******

the file extension must be .env or .txt.