more documentation

doc/examples/basic_json__const_int.cpp

@@ -0,0 +1,15 @@
+#include <json.hpp>
+
+using namespace nlohmann;
+
+int main()
+{
+    // an anonymous enum
+    enum { t = 17 };
+
+    // create a JSON number from the enum
+    json j(t);
+
+    // serialize the JSON numbers
+    std::cout << j << '\n';
+}