added UI list of the calculators

[chaitanyakatore]

Pull Request

I made user friendly and simple UI so user can use calculator according to there preferences

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)

Issue: #105

[chaitanyakatore]

if you like it please make this under HacktoberFest Its going to be my last contribution

[RuanAragao]

@chaitanyakatore I added the accept label, but it would be cool if you could improve the layout a little in low resolutions (mobile). Thanks for the contribution!

[chaitanyakatore]

@RuanAragao already made