doc: add NOTICE
doc: add NOTICE

mischief/ignition,higebu/ignition,higebu/ignition,dgonyeo/ignition,higebu/ignition,trnubo/ignition,AlexNPavel/ignition,trnubo/ignition,jonboulle/ignition,marineam/ignition,AlexNPavel/ignition,ajeddeloh/ignition,crawford/ignition,coreos/ignition,marineam/ignition,jonboulle/ignition,marineam/ignition,ajeddeloh/ignition,jonboulle/ignition,ajeddeloh/ignition,dgonyeo/ignition,coreos/ignition,crawford/ignition,trnubo/ignition,mischief/ignition,AlexNPavel/ignition,coreos/ignition,mischief/ignition,dgonyeo/ignition