Add ABOUT file, which is used by phar generator.
Add ABOUT file, which is used by phar generator.

agallou/atoum,CedCannes/atoum,jubianchi/atoum,gpaton/atoum,tejerka/atoum,CedCannes/atoum,GuillaumeDievart/atoum,jubianchi/atoum,mikaelrandy/atoum,GuillaumeDievart/atoum,agallou/atoum,tejerka/atoum,mageekguy/atoum,Tiross/atoum,Tiross/atoum,vonglasow/atoum,mageekguy/atoum,gpaton/atoum,mikaelrandy/atoum,vonglasow/atoum