Update App.js

[viendimine]

I have added a "Go Back" button in signup page

Pull Request

Title and Issue Number (mandatory)

Title #20

Issue No. :

Close #

Description (30-50 words)

## Screenshot (mandatory)

Files Changed (mandatory)

• Changed filename1
• Changed filename2
• ...

Checklist: (mandatory)

• [ ] I have mentioned the issue number in my Pull Request.
• [ ] I have commented my code, particularly in hard-to-understand areas

Additional context

Are you contributing under any Open-source programme?

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[Ritwika-14]

The changes you have made and the issue you mentioned to work on are both irrelevant.