add some passed codes

example.cpp

@@ -0,0 +1,12 @@
+#include<stdcpp.h>
+using namespace std;
+int plus(int a, int b){
+  return a+b;
+}
+int main(){
+  int first_add_number = 5;
+  int second_add_number = 10;
+  int result = plus(first_add_number, second_add_number);
+  cout<< result <<endl;
+  return 0;
+}