I am trying to add the shareKit files like in the photo:
...but Xcode will only let me do the drag and drop only for single files! How can I solve this?
What you need to do is simple:
1) Right click the sharekit folder in the first project and you will see show in finder. Click that.
2) That will lead to the folder in your directory.
3) Next pull the whole directory into second project. Make sure you copy the files over.
Hope this helps...