doc: add info

Author: JCPedroza

src/interview-classics/is-palindrome/README.md

@@ -1,14 +1,48 @@
 # Is Palindrome
 
-Create a function named isPalindrome that takes a string as an input, outputs
-true if the string is a palindrome, or false otherwise.
-
-Ignore the following characters
-
-- Whitespace
-- .
-- ,
-- :
-- ;
-- ?
-- !
+Write a function `isPalindrome` that takes a string as input, and returns
+whether the string is a palindrome.
+
+Punctuation is ignored when validating a palindrome. You only need to consider
+the following punctuation characters:
+
+```
+- . , : ; ? ! ' "
+```
+
+White space is also ignored when validating a palindrome. You only need to
+consider the followihg whitespace characters for this exercise
+
+ * `space`
+ * `tab`
+ * `new line`
+
+## Function Signagure
+
+```typescript
+function isPalindrome(str: string): boolean
+```
+
+## Expected Behavior
+
+```
+In: ''
+Out: true
+
+In: 'x'
+Out: true
+
+In: 'xy'
+Out: false
+
+In: '1230321'
+Out: true
+
+In: '1230123'
+Out: false
+
+In: ' a: \nbc.  c!-ba? "'
+Out: true
+```
+
+## Optimizations