v0.1.0

• Added hints when tasks finish. 添加了任务完成时的提示
• Added icon for Windows. 添加了 Windows 系统的图标
• I still hope to minimize the size of output, it is too large now. 现在输出文件太大了，还是想尽量减少一些

initial version

demo version maybe
in windows: DuckPDF.exe
in linux: ./DuckPDF