Merge pull request #79 from RenchuSong/master

Sorry, I added all images into the commit. Please help me to solve this warehouse consuming issue.
remove picture
update doc
Merge branch 'master' of https://github.com/Raysmond/FDUGroup
add test images
Merge branch 'master' of https://github.com/Raysmond/FDUGroup
fix bug: module base uri was wrong in Windows
wallet strategy