Imports of package internal

PathSynopsis
cloud.google.com/go/firestorePackage firestore provides a client for reading and writing to a Cloud Firestore database.
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
google.golang.org/api/iterator