Google Sign-In Sample App

CocoaPods

In the ../Samples/ObjC/SignInSample/ folder, run the following CocoaPods command to install the require dependencies:
```
pod install
```
Open the generated workspace:
```
open SignInSampleForPod.xcworkspace
```
Run the 'SampleForPod' target.

Swift Pacakage Manager

In the ../Sample/ObjC/SignInSample/ folder, open the Swift Package Manager project:
```
open SignInSample.xcodeproj
```
Run the 'SignInSample' target.