Sundown tonight marks the beginning of Rosh Hashanah, the Jewish New Year. DCist joins our parent site Gothamist in wishing a wonderful New Year to all of our Jewish friends and readers. For those who aren’t quite up-to-speed with their Rosh Hashanah knowledge, take a peek at chabad.org’s “Rosh Hashanah To Do List,” which outlines the basic traditions observed during this anuual celebration of renewal. And since DCist likes to bring food into most cultural…