Added README.md file

AnandD007 · web-flow · commit 96e78ac6d934 · 2021-02-27T23:21:33.000+05:30
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+<h1 align="center">Calculator</h1>
+It is used to calculate any simple mathematical equation.
+
+---------------------------------------------------------------------
+
+## How it works
+- It takes the mathematical equation by the User.
+
+- It returns the result of the mathematical equation.
+
+#### By [Avinash Kr. Ranjan](https://github.com/avinashkranjan)
