Add .gitattributes files (#783)
Add .gitattributes files (#783)

The .gitattributes file will prevent items such as test files, yaml files, etc from being included when this library is imported via composer
bshaffer/oauth2-server-php,svycka/oauth2-server-php,MattermarkStudios/oauth2-server-php,sariabod/oauth2-server-php