added cryptocurrency app

[BhartiNagpure]

517

Closes #517

Description

I am added cryptocurrency app.

Screenshots

Checklist

• [x] My code adheres to the established style guidelines of the project.
• [ ] I have included comments in areas that may be difficult to understand.
• [x] My changes have not introduced any new warnings.
• [x] I have conducted a self-review of my code.

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