feat(isPalindrome): add isPalindrome validator

[Tarun200999]

This PR adds a validator which validates input string is Palindrome or not.

Valid Palindromes : '', 'A' , "NOON", "Wow" Invalid Palindromes : "AB" , "JAVASCRIPT"

Checklist

• [x] PR contains only changes related; no stray files, etc.
• [x] README updated (where applicable)
• [x] Tests written (where applicable)

[codecov[bot]]

Codecov Report

Merging #1935 (c342c05) into master (c1b21a9) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master     #1935   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          102       103    +1     
  Lines         2085      2092    +7     
  Branches       472       473    +1     
=========================================
+ Hits          2085      2092    +7     

Impacted Files	Coverage Δ
src/index.js	100.00% <100.00%> (ø)
src/lib/isPalindrome.js	100.00% <100.00%> (ø)

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[WikiRik]

Not sure this has many use cases. Why would this be a good addition to this project?

[bennetfabian]

Not sure this has many use cases. Why would this be a good addition to this project?

I agree. In my opinion it's too much of an edge case if you're weighing package size, etc., against actual use.

[pano9000]

I also don't see any real use case for this, I can't think of any situation where you would want to validate e.g. in a form or similar, if a supplied string is a Palindrome or not

[pano9000]

@profnandaa what is your opinion on that?

I would otherwise want to close this down

[profnandaa]

Sure, we can close this one. @Tarun200999 -- effort appreciated, please take a look at open issues and see which one else you can pick up.