Imports of readline-im command

PathSynopsis
fmtPackage fmt implements formatted I/O with functions analogous to C's printf and scanf.
github.com/chzyer/readlineReadline is a pure go implementation for GNU-Readline kind library.
logPackage log implements a simple logging package.
math/randPackage rand implements pseudo-random number generators suitable for tasks such as simulation, but it should not be used for security-sensitive work.
timePackage time provides functionality for measuring and displaying time.