Resting Point

Hi,

Can someone explain to me what CS resting points are about? I see I can increase it by 10 if I pledge to protect it but I don't know what resting points do or how I can see what it is currently set at.

Also, I am allied with a Maritime CS and am getting a luxury resource from them but I don't seem to be getting the 3 food to my capital or 1 food to my other cities. Is this a bug or am I missing something?

Thanks!