Fix issue #9

[ShashankVM]

Issue 9

1. In the "Getting Started Wiki" -> "Run SystemC Simulation" subsection: on second command, it is not required to do "mkdir build" since build directory already exists. The counter example folder is in "build/icsc/examples", not "build/examples". So I fixed these errors.
2. Enhanced testbench and stopped simulation from hanging.
   Simulation used to hang since the time to stop was not mentioned. I fixed this. I also added a function to test reset and to print the signals and to print a message "simulation complete" once the simulation is done. This gives the user a feedback of the simulation results.

The output now looks like this:

shashank@shashank-desktop:~/systemc-compiler/build$ cd icsc/examples/counter && ./counter

        SystemC 2.3.3-Accellera --- Jun 16 2021 21:27:55
        Copyright (c) 1996-2018 by all Contributors,
        ALL RIGHTS RESERVED
Clock           Time            Reset           Counter         Even
0               0 s             0               0               0
1               1 ns            1               1               0
1               2 ns            0               0               1
1               5 ns            1               1               0
1               6 ns            1               2               1
1               7 ns            1               3               0
1               8 ns            1               4               1
1               9 ns            1               5               0
1               10 ns           1               6               1
1               11 ns           1               7               0
1               12 ns           1               8               1
1               13 ns           1               9               0
1               14 ns           1               10              1
1               15 ns           1               11              0
1               16 ns           1               12              1
1               17 ns           1               13              0
1               18 ns           1               14              1
1               19 ns           1               15              0
1               20 ns           1               0               1
1               21 ns           1               1               0

                *****Simulation complete*****
shashank@shashank-desktop:~/systemc-compiler/build/icsc/examples/counter$