Imports of package metadata

PathSynopsis
contextPackage context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes.
encoding/jsonPackage json implements encoding and decoding of JSON as defined in RFC 7159.
errorsPackage errors implements functions to manipulate errors.
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
timePackage time provides functionality for measuring and displaying time.