Address service support for geocoder-php library

Geocoder is a PHP library that supports the development of geo-based applications. It provides an abstraction layer for geocoding operations as well as an extensive API.

In order to be able to use the OGD Vienna Address Service, the library has been extended by an additional adapter. This adapter is available in the "[Geocoder Extra](https://github.com/geocoder-php/geocoder-extra)" package, which must be loaded in addition to the [Geocoder library](https://github.com/geocoder-php/Geocoder) in order to use it.

Official site of the geocoder project including links to documentation and implementation examples: <http://geocoder-php.org/>

地理编码器（Geocoder）是一款用于支撑地理信息类应用开发的PHP库，可为地理编码（geocoding）操作提供抽象层，并配备了功能完备的应用程序编程接口（API）。

为支持维也纳OGD地址服务（OGD Vienna Address Service）的使用，该库额外扩展了一款适配器。此适配器收录于[Geocoder Extra](https://github.com/geocoder-php/geocoder-extra)包中，使用者需在加载[Geocoder库](https://github.com/geocoder-php/Geocoder)的基础上额外加载此包，方可正常使用该适配器。

该地理编码器项目的官方网站（包含文档与实现示例的相关链接）：<http://geocoder-php.org/>