message: Bundle: add API docs.
diff: namespace oatpp { namespace data {
  +/**
  + * Bundle of auxiliary data.
  + */
  class Bundle {
  private:
  std::unordered_map<oatpp::String, oatpp::Void> m_data;
  public:
  + /**
  + * Default constructor.
  + */
  + Bundle() = default;
  +
  + /**
  + * Default virtual destructor.
  + */
  + virtual ~Bundle() = default;
  +
  + /**
  + * Put data by key.
  + * @param key
  + * @param polymorph
  + */
  void put(const oatpp::String& key, const oatpp::Void& polymorph);
  + /**
  + * Get data by key.
  + * @tparam WrapperType
  + * @param key
  + * @return
  + */
  template<typename WrapperType>
  WrapperType get(const oatpp::String& key) const {
  auto it = m_data.find(key);
  @@ -53,6 +77,10 @@ public:
  return it->second.template staticCast<WrapperType>();
  }
  + /**
  + * Get map of data stored in the bundle.
  + * @return
  + */
  const std::unordered_map<oatpp::String, oatpp::Void>& getAll() const;
  };
  