* feat: used regex instead of Set
* docs: add js doc
* docs: add comments of workable code
* style: format via standardJs
* docs: add details explanation of pangram regex
* docs: add example
* feat: add two implemetaion of
The first implementation with regex and second via HashSet & add the test code for both
* chore: add QNA format of **Pangram**
* style: format with standardJs
* resolve: removed 'Ans'
