Added padding function (projectdiscovery#75)

* Added padding function

* Added test cases

* rename to padding + minor improvements

* add example in README.md

---------

Co-authored-by: Tarun Koyalwar <[email protected]>

Added padding function (projectdiscovery#75)

* Added padding function

* Added test cases

* rename to padding + minor improvements

* add example in README.md

---------

Co-authored-by: Tarun Koyalwar <[email protected]>