Fix typo in README.md

Author: Ehthikash

README.md

@@ -2,15 +2,15 @@
 
 ## Simple Interest Calculator
 
-A calculator that calculates simple interest given principal, annual rate of interest and time period in years.
+A calculator that calculates simple interest given principle, annual rate of interest and time period in years.
 
 ```
 Input:
-   p, principal amount
+   p, principle amount
    t, time period in years
    r, annual rate of interest
 Output
    simple interest = p*t*r
 ```
 
-_© 2022 XYZ, Inc._
+_ehthikash._