Add documentation for usage on platforms other than Linux about elmobd HOT 3 OPEN

There are no peculiarities for TCP connected ELM327 devices for the various platforms.
In principle most of the operating systems supported by Go are supported by elmobd as well.

Serial connected devices should be supported for Linux, Windows and POSIX compliant operating systems according to: https://github.com/tarm/serial

Some examples for the address string using in the elmobd.NewDevice():

• tcp://example.com
• tcp://192.168.1.100:1234 (TCP IP:Port pair)
• tcp4://example.com:1234 (IPv4+TCP connection)
• tcp6://example.com:1234 (IPv6+TCP connection)
• unix:/path/to/obd2.sock (Unix Domain Socket)
• serial:///dev/ttyUSB0 (Serial port on Linux or POSIX)
• serial://COM5 (Serial port on Windows)

from elmobd.

To make it work on my macbook, I had to install this: https://pbxbook.com/other/mac-tty.html (the prolific one). Then the the device to use was: /dev/tty.usbserial

from elmobd.

Would greatly appreciate if a Windows-user could test the library on Windows and tell me what needs to be changed in the documentation when using Windows.

from elmobd.