cpp:loops: Added for example

cpp/loops/for.cpp

@@ -0,0 +1,12 @@
+#include<iostream>
+
+int main(){
+	int i;;
+	int total = 0;
+
+	for (i = 50; i < 101; i++){
+		total += i;
+		std::cout << i << " " << total << std::endl;
+	}
+	return 0;
+}