Add lib.rs for testing project
Add extern declaration for testing
Add accessibility for add_three_times_four() for testing suite
Delete foo and bar test tests
Add fn to get loadavg and print to stdout
Add match syntax to work with Result of reading file

In order to start accessing the elements of the contents of
/proc/loadavg, it was necessary to employ match syntax so that
it would be a String, that could be coerced to a &str.

Programme now returns the cotents of /proc/loadavg at the
moment of execution. A loop {} was added to main(); however,
it just repeats the value at the time of execution, not the
most recent.  Will need to figure out how to end the file
read and do it again, I think.
Adjust loop {} structure

Moved loop from main into get_loadavg(). However, the behaviour is
the same. Still need to re-read the file in each iteration of the
loop, rather than having it read once, then continue printing out
the same values.
Remove loop {} call from function body

Removed the loop to execute within the body of main. Added a return
statement to halt the program each time output is printed.

It seems to be a matter of waiting long enough to observe the changes
in load on the commandline. This function is working now, though!