Add pause to tools

tools/audio.cpp

@@ -323,5 +323,7 @@ main(int argc, char *argv[]) {
     audio::print_device(device);
   }
 
+  system("pause");
+
   return 0;
 }

tools/dxgi.cpp

@@ -78,5 +78,7 @@ main(int argc, char *argv[]) {
     }
   }
 
+  system("pause");
+
   return 0;
 }