Palindrome using iterators

[rcchcz]

This PR implements the code for palindrome checker in C++. This version uses iterators and has a different strategy.

I have read the contributing guidelines in CONTRIBUTING.md and have ensured the following:

• [x] My code is placed in the required directory as outlined in CONTRIBUTING.md
• [x] My code file is named according to CONTRIBUTING.md
• [x] Variables, classes, functions etc. follow camel case as outlined in CONTRIBUTING.md
• [x] My code hasn't been implemented or claimed by someone else and I have checked the present issues and PRs for the same
• [x] My code is well commented
• [x] If my code is the first implementation of , I have added the link to this directory in README.md
• [x] I have not copied my code from anywhere

[codelixir]

Hey, @rcchcz! The code looks good, just one tiny change - please change the name of the file to something like palindrome_WithIterators.cpp (following @deutranium's comment on #191).

Also, according to this repo's CONTRIBUTING.md, you are supposed to comment on the corresponding issue (#161 in this case) before making a PR.

It's okay, I'll merge it this time once you make the change, but please keep this in mind in the future : )

[rcchcz]

Oh, my mistake, sorry! I'll fix it now. Thanks!

[deutranium]

Looks great, thanks for contributing!