size_table.md

Code Size of coreMQTT (example generated with GCC for ARM Cortex-M)
File	With -O1 Optimization	With -Os Optimization
core_mqtt.c	3.0K	2.6K
core_mqtt_state.c	1.4K	1.1K
core_mqtt_serializer.c	2.5K	2.0K
Total estimates	6.9K	5.7K