adding cs142 code

cs142/lab09/iotest.cpp

@@ -0,0 +1,27 @@
+#include <iostream>
+#include <vector>
+#include <stdexcept>
+
+using namespace std;
+
+#include "io.h"
+#include "restaurant.h"
+
+const string usage = "usage: iotest <input json file>";
+
+int main(int argc, char * argv[]) {
+    if (argc != 2) {
+        cerr << usage << endl;
+        return 1;
+    }
+    try {
+        vector<restaurant> v = parse_file(argv[1]);
+        for(auto r: v) {
+            cout << r << endl;
+        }
+    }
+    catch(runtime_error e) {
+        cerr << e.what() << endl;
+    }
+    return 0;
+}