Add initialization code section missing import statements (iOS)

Issue in /src/pages/documentation/getting-started/get-the-sdk.md

The Add Initialization code section in iOS is missing import statements while Android has them.

Open /src/pages/documentation/getting-started/get-the-sdk.md and find the iOS Add Initialization code section. Compare it with the Android section's import statements, then add the missing iOS imports. Done means the iOS example includes the required import statements consistently with the surrounding setup instructions.

Written by the indexing model from the issue text.