DEPENDENCY:
 GNU Readline library. Before build, please make sure this library has been
 installed in your build system. It can be downloaded from link:
 https://tiswww.case.edu/php/chet/readline/rltop.html

HOT TO BUILD AND RUN:
 GRU build is very easy, just go to source code, then run “make”. A new binary
 named “gru” will be in the folder.
 To run GRU, just run “./gru” without any additional arguments. Note, GRU need
 be run with root permission.
