So, to get the Resources group back, do this:
- Right-click on your project icon in the navigation view on the left (blue icon).
- Rename the group to "Resources."
- That's it.
But what if you also want the Resources folder on your disk? Easy:
- Open Finder.
- Navigate to your project folder and create a new folder on the same level of the .xcodeproj directory, named "Resources".
- Back in Xcode, select the Resources group and activate the "Utilities" view (all the way in the top right corner next to the Organizer icon).
- Under the "Location" drop down box you see a small white-ish icon: Click it: A dialog called "Choose a directory this group represents" will come up.
- Choose the Resources folder you created in step 2.
- That's it. Now you can drag resources into the Resources group in Xcode and they will end up in the Resources folder on your disk.