百度离线地图的开发相关文档，以及瓦片的下载和使用，谢谢亲的照顾(Baidu offline map development related documents, as well as the download and use tiles, thank you for the pro care)

百度地图离线文件2.0版本，用于地图离线开发，(Baidu map offline file version 2.0, for offline map development.)