* add test cases for checkAnagram function to cover additional inputs and edge cases
* adjust spacing between tests to be more consistent with other files
* update CheckAnagram to return boolean value instead of string
* add a reference link and definition of Anagram to CheckAnagram documentation
* Add CheckAnagram.js to String Algorithms that checks if Strings are anagrams
* Add CheckAnagram.js to String Algorithms that checks if Strings are anagrams
* Add CheckAnagram.js to String Algorithms that checks if Strings are anagrams