prime sieve of eratosthenes code in c++

[zahinekbal]

Before making PR check this....

File Format:-

PrimeSieve/CPP/PrimeSieve.c++

Please add your image in image folder nd update readme.md file This is for all contributors

do this then only i will be able to merge PR...
Check this
#90 (comment)

[vaibhavhariramani]

I would like to work on this issue in C++

[vaibhavhariramani]

hey,
I have added Sieve_of_Eratosthenes_algorithm.cpp please merge my pr #152
and add hacktober - accepted

[saipranay47]

@zahinekbal, please check.

[vaibhavhariramani]

I have added Sieve_of_Eratosthenes_algorithm.cpp with the changes requires please merge my pr #153
and add hacktober - accepted