Update constructor_destructor.md

[gehfand729]

`//파일이름: 소멸자.cpp
//작성자: 20183487 이승찬
#include
using namespace std;

class Person
{
private:
string name;
int age;

public:
Person() //생성자
{
name = "Hong Gildong";
age = 20;
}
void Showinfo() {
cout << name << endl;
cout << age << endl;
}
~Person() //소멸자
{
cout << "객체가 소멸됨" << endl; //소멸자가 사용되었는지 확인을 위함
}
};

int main() {
Person* man1 = new Person;
man1->Showinfo();
delete man1;

}`