added items() function #874

doc/examples/items.cpp

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+#include <iostream>
+#include "json.hpp"
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_object = {{"one", 1}, {"two", 2}};
+    json j_array = {1, 2, 4, 8, 16};
+
+    // example for an object
+    for (auto& x : j_object.items())
+    {
+        std::cout << "key: " << x.key() << ", value: " << x.value() << '\n';
+    }
+
+    // example for an array
+    for (auto& x : j_array.items())
+    {
+        std::cout << "key: " << x.key() << ", value: " << x.value() << '\n';
+    }
+}

doc/examples/items.link

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+<a target="_blank" href="https://wandbox.org/permlink/E7h0HOuw778Ski8S"><b>online</b></a>

doc/examples/items.output

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+key: one, value: 1
+key: two, value: 2
+key: 0, value: 1
+key: 1, value: 2
+key: 2, value: 4
+key: 3, value: 8
+key: 4, value: 16