updated the README

Author: codewithmide

Palindrome_Checker/Palindrome_checker.md

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+Return `true` if the given string is a palindrome. Otherwise, return `false`.
+
+A palindrome is a word or sentence that's spelled the same way both `forward` and `backward`, ignoring punctuation, case, and spacing.
+
+Note: I'll need to remove all non-alphanumeric characters (punctuation, spaces and symbols) and turn everything into the same case (lower or upper case) in order to check for palindromes.
+
+We'll pass strings with varying formats, such as `racecar`, `RaceCar`, and `race CAR` among others.
+
+We'll also pass strings with special symbols, such as `2A3*3a2`, `2A3 3a2`, and `2_A3*3#A2`.