add some npm command for biginner: run http server and build static file.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
replace Makefile with npm command for all developer.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Merge pull request #4 from appleboy/patch

Replace Makefile with npm command for all developer using windows environment