Add steps for enabling Crashlytics in Xcode

Author: kenstir

docs/pn-setup-guide/configure-hemlock-app.md

@@ -20,3 +20,5 @@ This guide is for the mobile app developer.
   * Click "+ Capability" and add the "Background Modes" capability, then select "Remote notifications"
   * For cleanliness, move the newly created .entitlements file (drag it in Xcode to Source/pines_app/)
   * Close Xcode, then edit the project.pbxproj to fix the relative path `CODE_SIGN_ENTITLEMENTS = Source/pines_app/PINES.entitlements;`
+* Configure Xcode to produce and upload dSYMs for Crashlytics per the [Firebase instructions](https://firebase.google.com/docs/crashlytics/get-deobfuscated-reports?platform=ios)
+* Optionally enable the Firebase Console Debug View by adding `-FIRDebugEnabled` and `-FIRDebugDisabled` to your build scheme per the [Crashlytics >> Test your implementation](https://firebase.google.com/docs/crashlytics/test-implementation?platform=ios)