After creating an Xcode project and finding the Info.Plist file, you may try adding NSContactsUsageDescription key, which should accept a string value.
A complete list of Cocoa Keys
Hope that helps!
EDIT
A part from the doc: (which can help you understand why it is crashing)
Important: To protect user privacy, an iOS app linked on or after iOS
10.0, and which accesses the user’s contacts, must statically declare the intent to do so. Include the NSContactsUsageDescription key in
your app’s Info.plist file and provide a purpose string for this key.
If your app attempts to access the user’s contacts without a
corresponding purpose string, your app exits.