Merge commit 'b9112977b074d67d6c83f04af36b6dabdf1d92c6' as 'external/json'

external/json/docs/examples/nlohmann_json_version.cpp

@@ -0,0 +1,12 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    std::cout << "JSON for Modern C++ version "
+              << NLOHMANN_JSON_VERSION_MAJOR << "."
+              << NLOHMANN_JSON_VERSION_MINOR << "."
+              << NLOHMANN_JSON_VERSION_PATCH << std::endl;
+}