Created a blastoff program in cpp

[yocki8]

1. Blastoff -> Prints the natural numbers from 1 to n in reverse order by iterating reverse n times.
2. Magic number spiral -> Beautify the table by identifying number of digits of maximum element in the table and creates a spiral pattern.

[arun-kushwaha04]

@yuvimalhotra28 thanks for contributing. Can you provide a brief description of the algorithm and add the same as comment in the file.