init repo.

third_party/jsoncpp/example/stringWrite/stringWrite.cpp

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+#include "json/json.h"
+#include <iostream>
+/** \brief Write a Value object to a string.
+ * Example Usage:
+ * $g++ stringWrite.cpp -ljsoncpp -std=c++11 -o stringWrite
+ * $./stringWrite
+ * {
+ *     "action" : "run",
+ *     "data" :
+ *     {
+ *         "number" : 1
+ *     }
+ * }
+ */
+int main() {
+  Json::Value root;
+  Json::Value data;
+  constexpr bool shouldUseOldWay = false;
+  root["action"] = "run";
+  data["number"] = 1;
+  root["data"] = data;
+
+  if (shouldUseOldWay) {
+    Json::FastWriter writer;
+    const std::string json_file = writer.write(root);
+    std::cout << json_file << std::endl;
+  } else {
+    Json::StreamWriterBuilder builder;
+    const std::string json_file = Json::writeString(builder, root);
+    std::cout << json_file << std::endl;
+  }
+  return EXIT_SUCCESS;
+}