mention submodule command and --api-port in README
mention submodule command and --api-port in README

getlantern/lantern-java,getlantern/lantern-java,getlantern/lantern-java,lqch14102/lantern,lqch14102/lantern,lqch14102/lantern,lqch14102/lantern,lqch14102/lantern,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java,getlantern/lantern-java,getlantern/lantern-java,lqch14102/lantern,getlantern/lantern-java,lqch14102/lantern,lqch14102/lantern,getlantern/lantern-java