Added Math Calculator Web App

[NilanjanPramanik]

Description

Feature : Math Calculator . This is a basic calculator app.

Issue

Fixes #3

Type of change

• [ ] Bug fix
• [x] New Project

Checklist:

• [x] I have included a REAME file for my Project (not for Bug fix)
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have followed the Contributing Guidelines

[prodigyinfotech]

It is being undertaken by someone else. Please be considerate of the rules before opening new PR