204. | Count Primes | C++

[anshkush92]

Problem name: Count Primes
Difficulty: Medium
Language: C++

[beheradibas]

Please assign me.

[anshkush92]

I believe I don't have the power to assign the issue to someone. I made it for myself so the maintainer can assign it to me.
In contributing guidelines, it is written to contribute an algorithm, you should raise a issue so I raised issue for that only.