Revise README to focus on calculator output

Removed introductory section and copyright notice.

Author: 1DeliDolu

README.md

@@ -1,16 +1,8 @@
-# Introduction to Git and GitHub
-
-## Simple Interest Calculator
-
 A calculator that calculates simple interest given principal, annual rate of interest and time period in years.
 
-```
 Input:
    p, principal amount
    t, time period in years
    r, annual rate of interest
-Output:
+Output
    simple interest = p*t*r
-```
-
-_© 2022 XYZ, Inc._