Fix README instructions

[gabrik]

Hi,

I would first like to thank you for this very useful library.

I started using it with my simulated ECU: https://github.com/spoonieau/OBD2-ECU-Simulator but I was not getting out the right data, while Torque or other ODB apps were able to get them.

I found that the readme lacked some PID configuration for the command to parse the data.

So before I got this data:

2023-12-27 14:15:43.998 29171-30361 PID                     io.xxx.xxx                   D   : 0.0
2023-12-27 14:15:43.998 29171-30361 PID Formatted Result    io.xxx.xxx                   D  0.0 null
2023-12-27 14:15:45.103 29171-30361 PID                     io.xxx.xxx                   D   : 0.0
2023-12-27 14:15:45.103 29171-30361 PID Formatted Result    io.xxx.xxx                   D  0.0 null

Then after passing the right parameters to the PID I got ( I configured the simulator to 2000RPM):

2023-12-27 15:14:04.268 29162-30222 PID                     io.xxx.xxx                   D   : 2000.0
2023-12-27 15:14:04.268 29162-30222 PID Formatted Result    io.xxx.xxx                   D  2000.0 null
2023-12-27 15:14:05.376 29162-30222 PID                     io.xxx.xxx                   D   : 2000.0
2023-12-27 15:14:05.377 29162-30222 PID Formatted Result    io.xxx.xxx                   D  2000.0 null
2023-12-27 15:14:06.483 29162-30222 PID                     io.xxx.xxx                   D   : 2000.0

I hope this will be helpful to other developers using this library.

[gabrik]

As a side note, I guess some more commands needs to be sent into the socket to properly configure the device.

As if I open torque and then my app everything works just fine, while if I connect the ODB device and open directly my app I get a bunch of garbage data.

Any help in that direction will be more than appreciated, so that I can include it in this PR.