Add a document about scaling fleet
Add a document about scaling fleet

esatterwhite/fleet,giantswarm/fleet,improbable-io/fleet,dalbani/fleet,dalbani/fleet,jonboulle/fleet,coreos/fleet,paveltiunov/fleet,mookjp/fleet,endocode/fleet,dalbani/fleet,esatterwhite/fleet,dongsupark/fleet,bviswana101/fleet,improbable-io/fleet,endocode/fleet,improbable-io/fleet,coreos/fleet,jonboulle/fleet,giantswarm/fleet,jonboulle/fleet,paveltiunov/fleet,dongsupark/fleet,mookjp/fleet,bviswana101/fleet,endocode/fleet,giantswarm/fleet,coreos/fleet,dongsupark/fleet