Upload a file in the UI frontend

[msanyoto]

User story

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As a user, I would like to be able to upload a text or json file to the react frontend application, so that I can transfer this file later.

Acceptance Criteria

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• In the send section (app dashboard), there should be a text or button "submit" that asked the user for a file to be uploaded when clicked.
• The frontend should change the state, to show that the user file is already uploaded and then send a request to the backend.
• The backend should be able to target these files.
• Since, there is no persistent data storage yet, the server should simply give a response to the user which is the name of the file to the frontend.
• In the sent section (app dashboard) the user should be able to see the name of the file that user has submitted.
• see https://www.geeksforgeeks.org/file-uploading-in-react-js/ for reference.

DoD General Criteria

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• Feature has been merged into the main branch
• Feature has been added to the documentation
• Product owner approved features
• Developers agreed to release