新手，刚刚下了nodejs按照bootstrap中文文档上面进入 /bootstrap/ 根目录，然后执行 npm install 命令就一直出错

错误如下：
D:\bootstrap-3.3.5-dist>npm install
npm ERR! install Couldn't read dependencies
npm ERR! Windows_NT 10.0.10586
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "install"
npm ERR! node v4.4.3
npm ERR! npm v2.15.1
npm ERR! path D:\bootstrap-3.3.5-dist\package.json
npm ERR! code ENOPACKAGEJSON
npm ERR! errno -4058
npm ERR! syscall open
npm ERR! package.json ENOENT: no such file or directory, open 'D:\bootstrap-3.3.5-dist\package.json'
npm ERR! package.json This is most likely not a problem with npm itself.
npm ERR! package.json npm can't find a package.json file in your current directory.
npm ERR! Please include the following file with any support request:
npm ERR! D:\bootstrap-3.3.5-dist\npm-debug.log

沒有package. json