Added JsonObject iterator

Examples.md

@@ -54,16 +54,35 @@ getting the data on JSON format and parsing the buffer:
       MET->MTwindspeed      = _ooo ["windSpeed"];  // speed
       MET->MTobservationtime= _ooo ["datetime"];  // time
 
-## Example 3: use iterators
-
+## Example 3: iterators
 
 ```c++
-JsonArray & array;
+JsonArray& array;
 
-for(JsonArray::iterator it=array.begin(); it!=array.end(); ++it) {
+for(JsonArray::iterator it=array.begin(); it!=array.end(); ++it) 
+{
+    // *it contains the JsonVariant which can be casted as usuals
     const char* value = *it;
-    Serial.println(value);
-    // or
-    Serial.println(it->as<const char*>());
+
+    // this also works: 
+    value = it->as<const char*>();    
+
+}
+```
+
+```c++
+JsonObject& object;
+
+for(JsonObject::iterator it=object.begin(); it!=object.end(); ++it) 
+{
+    // *it contains the key/value pair
+    const char* key = it->key;
+
+    // it->value contains the JsonVariant which can be casted as usual
+    const char* value = it->value;
+
+    // this also works
+    value = it->value.as<const char*>();
+    
 }
 ```