Here is some additional information and some addition resources in case you need further assistance with Firebase or Firestore.
flutter doctor --android-licenses issue
If you see this error and can't resolve it, and you're in Android Studio, go to Android Studio > System Settings > Android SDK > SDK Tools on Mac (File > Settings > Android SDK > SDK Tools on Windows) and enable Command-line tools.
"Warning: CocoaPods recommended version 1.10.0 or greater not installed."
Just run "sudo gem install cocoapods" from terminal and that should resolve your issue.
"CocoaPods could not find compatible versions for pod 'Firebase/Firestore'"
Make sure you set the minimum iOS version to 10 in the Xcode section of the tutorial.
Other podfile or CocoaPods related issues
You might try deleting the podfile.lock file and then running "pod install" from within Android Studio terminal.
Other Resources
FlutterFire - Official Firebase plugins and resources for Flutter
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