Added new ReadAnalogSingle example based on question from 'jam lam'
Added new ReadAnalogSingle example based on question from 'jam lam'

As per question at
https://www.cemetech.net/forum/viewtopic.php?p=263645#263645,
created new ReadAnalogSingle example that demonstrates returning a
single real value to the calculator in response to a Get() command.

KermMartian/ArTICL