安装了Windows版Atom之后没办法使用apm命令行，但是官网文档写的是Windows版自动安装atom和apm命令的：
This will install Atom, add the atom and apm commands to your PATH,
create shortcuts on the desktop and in the start menu, add an "Open
with Atom" context menu in the Explorer and make Atom available for
association with files using "Open with…"
除非使用了便携版链接，可是我点击的是主页的“Download Windows Installer”啊
Note that there are some limitations to portable mode: No Explorer
integration or command-line PATH setup The .atom folder must be
alongside the folder containing atom.exe (not inside it) The .atom
folder must be writeable The ATOM_HOME environment variable must not
be set (this overrides > portable behavior)
有没有办法为Windows版Atom设置环境变量呢？