updated README.md: documented MLIST-OBJECT-SLOTS, MSIZE-OBJECT-SLOTS, MREAD-OBJECT-SLOTS, MWRITE-OBJECT-SLOTS
updated README.md: documented MLIST-OBJECT-SLOTS, MSIZE-OBJECT-SLOTS, MREAD-OBJECT-SLOTS, MWRITE-OBJECT-SLOTS

cosmos72/hyperluminal-mem