增加DrawerAdpater
下一步完善抽屉的自定义布局

Signed-off-by: Harry Chen <373685963@qq.com>
文件编码改为UTF-8，行分隔符改为LF
抱歉我的疏忽，创建项目时忘记设定
请吸取教训

Signed-off-by: Harry Chen <373685963@qq.com>
给Drawer的ListItem增加图标

Signed-off-by: Harry Chen <373685963@qq.com>
Merge pull request #1 from PaperAirplane-Dev-Team/base_structure

Built up base structure