Shamelessly copy Josiah

source/lib/json/docs/examples/rbegin.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create an array value
+    json array = {1, 2, 3, 4, 5};
+
+    // get an iterator to the reverse-beginning
+    json::reverse_iterator it = array.rbegin();
+
+    // serialize the element that the iterator points to
+    std::cout << *it << '\n';
+}