added pointer for jetty-nosql-memcached-parent repository in README
added pointer for jetty-nosql-memcached-parent repository in README

hongzhenglin/jetty-nosql-memcached,yyuu/jetty-nosql-memcached,kauppalehti/jetty-nosql-memcached-legacy,tokuhirom/jetty-nosql-memcached,fengshao0907/jetty-nosql-memcached