Here’s a first look at Java Nation, which arrived on Rockville Pike this week in the former Addie’s/Helen’s space next to Hank Dietle’s. The cafe will open early in the morning and stay that way until 9:30 or 10 most evenings, with a moderately priced menu of sandwiches, salads, soups and crepes plus a few dishes from El Salvador and Peru. Owner Simona Cabana, who also has a location in Kensington, imports her coffee beans from small suppliers and roasts them right behind the bar. Coming soon: a signature menu of caffeine-infused cocktails.