Add template directory

template will contain the configuration for different project.
 - one project has a subdir here, e.g. koala, panda
 - component includes:
   fs_url.json     // repo info of filesytem customization
   filesystem      // native filesystem customization
   x86_64/         // arch configuration
     distlist          // packages that will be included
     toolchain         // toolchain name
     toolchain_var.mk  // toolchain variable setting

Signed-off-by: Kui Shi <skuicloud@gmail.com>