Add include compiler directive and some libraries.

[NeeEoo]

I don't think that this code is efficient. So you can commit to this pull request to fix stuff.

This pull request is a draft since there are still some stuff that needs to be improved.

#include <math.code>

int main() {
    printint(sqrt(16)); // prints 4
}

[NeeEoo]

Merge conflicts are annoying.

[NeeEoo]

I don't know what happened to the merge conflict. I didn't even fix it

[elikaski]

This is wonderful, I'll review it when I have the time :)

[abhra2020-smart]

I just graduated from CS and did learn that it's really simple