Assignment 0.
Merge pull request #11 from ihciah/master

13307130364 commit assignment0
Merge pull request #10 from jackyyf/master

Assignment 0 by 13307130355
Create hello
Create hello.cpp
Merge pull request #13 from foreverXZC/patch-1

Create hello by 13307130057
Revert "Create hello"
Merge pull request #15 from ds-sww/revert-13-patch-1

Revert "Create hello"
Merge pull request #14 from foreverXZC/patch-2

Create hello.cpp
Update README.md
Update README.md

啊呀呀Preview和实际不一致，居然不换行。。
add hello.cpp
Merge pull request #16 from Musicman-Ji/master

add hello.cpp