added the README file for challenge_8

solutions/challenge_8/README.md

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+# Challenge: Palindrome Detector
+
+## Description
+
+The "Palindrome Detector" challenge involves determining if a given string
+or bytes is a palindrome.
+A palindrome is a word, phrase, or sequence that reads the same backward as
+forward, ignoring spaces, punctuation, and case.
+
+Write a function that takes a string or bytes as input and returns `True` if
+it is a palindrome, and `False` otherwise.
+
+For example:
+
+- The string `A man, a plan, a canal, Panama` is a palindrome.
+- The string `hello` is not a palindrome.
+- The bytes `b"racecar"` is a palindrome.
+- The bytes `b"hello"` is not a palindrome.
+
+## Example
+
+```python
+is_palindrome("A man, a plan, a canal, Panama")
+# Output: True (ignoring spaces, punctuation, and case)
+
+is_palindrome("hello")
+# Output: False (not a palindrome)
+
+is_palindrome(b"racecar")
+# Output: True (ignoring spaces, punctuation, and case)
+
+is_palindrome(b"hello")
+# Output: False (not a palindrome)