This is a meta package that pulls in all the sample Magento 2 modules from packages.magento.com
To use these samples you will first need to install Magento 2.
Update the root composer.json for Magento 2 to add a dependency on this package.
This can be done by adding the following to the 'require' section.
"magento/sample-bundle-all": "*"
Ensure you have the package.magento.com added as a repository in your composer.json and then run composer update to have composer download the sample modules.
Once installed, run the Magento 2 setup application and enable each of the installed modules.