added code for reverse integer problem

[Rishabhraghwendra18]

Pull Request Template

Question number - 7

Issue no.(must) - #7

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• One Change in one Pull Request
• My file is in proper folder (Name of folder should be Question number) (E.g. 120)
• I am following clean code and Documentation and my code is well linted with flake8.
• I have added README.md (With question description)
• I have added sufficient comments in my code

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