adding cs142 code

cs142/lab09/restaurant.cpp

@@ -0,0 +1,8 @@
+#include "restaurant.h"
+
+using namespace std;
+
+ostream & operator<<(ostream & os, restaurant & r) {
+    os << "{\"name\": \"" << r.name << "\", \"score\": " << r.score << "}";
+    return os;
+}