Created nlohmann::basicjson::rbegin (markdown)

nlohmann::basicjson::rbegin.md

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+```cpp
+iterator rbegin();
+const_iterator rbegin() const;
+const_iterator crbegin() const;
+```
+
+## Description
+
+Returns a reverse iterator to the first element of the reversed JSON container. It corresponds to the last element of the non-reversed container.
+
+![illustration of reverse iterators](http://upload.cppreference.com/mwiki/images/3/39/range-rbegin-rend.svg)
+
+## Parameters
+
+None.
+
+## Return value
+
+Reverse iterator to the first element.
+
+## Complexity
+
+Constant, as long as `ArrayType` and `ObjectType` satisfy the [Container concept](http://en.cppreference.com/w/cpp/concept/Container).
+
+## Exceptions
+
+None. The function's noexcept-specification is `noexcept`.
+
+## See also
+
+- [**rend**, **crend**](https://github.com/nlohmann/json/wiki/nlohmann::basicjson::rend)<br>
+  returns a reverse iterator to the end