Add client support, use it to dump json to stdout first.

client.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include "common.h"
+
+#define SERIALIZE_LEN 256
+
+
+struct serializer *client_get_serializer(char *);
+void client_add(int, struct serializer *);
+void client_write(struct packet *);