added Roman-number-calculator

[nitishkumar07]

Pull Request

Description (required)

Added Roman number calculator A clear and concise description of what your calculator does or the problem/improvement it is solving. Roman number calculator converts roman numbers to decimal numbers and decimal numbers to roman numbers. It is not case-sensitive which means if you are inputting roman numbers you can put lower case still it takes as input.

Checklist (required)

• [ x ] I have read and understand the contribution guidelines.
• [ x ] I have tested this code.
• [ x ] I have updated the documentation.
• [ x ] I followed the standards described in the README.
• [ x ] I have reviewed and addressed any comments and feedback.

Screenshots (optional)

Related Issues (required)

Issue: #108 [Link to any related issues or tasks.]

[nitishkumar07]

please check the pull request

[RuanAragao]

@nitishkumar07 Thanks for your contribution! One recommended improvement: handle invalid values.