[embedded broker] Improve readme
[embedded broker] Improve readme

Improve readme

Signed-off-by: David Gräff <cddf4d21ffd604ccd3fdffe1267f1f9d72e179ea@web.de>
theoweiss/openhab2,clinique/openhab2,Snickermicker/openhab2,clinique/openhab2,Snickermicker/openhab2,theoweiss/openhab2,Snickermicker/openhab2,theoweiss/openhab2,clinique/openhab2,Snickermicker/openhab2,theoweiss/openhab2,clinique/openhab2