[console] Update readme add executable + how to contribute
[console] Update readme add executable + how to contribute

revagomes/DrupalConsole,revagomes/DrupalConsole,dkgndec/DrupalConsole,dkgndec/DrupalConsole,dkgndec/DrupalConsole,Cottser/DrupalConsole,Cottser/DrupalConsole,revagomes/DrupalConsole,Cottser/DrupalConsole