Creates a genserver able to talk to an external Fortran server

Use make to compile the project.

To build each step manually, run:

	gfortran *.f90 -o newton
	erlc *.erl

Run erl to start the Erlang session. In the Erlang shell, you can start the f90 genserver by using the compiled program name, and execute commands in the genserver API:

    Eshell V13.1.2  (abort with ^G)
    1> f90:start_link("./newton").
    {ok,<0.84.0>}
    2> f90:force(90,80).
    7200 

The genserver creates a port to the external program. A port is an erlang process that manages and communicates with external programs.

The Fortran program expects inputs from stdin (which are provided by the port), such as:

• mass [value]: stores the value in the mass variable
• accel [value]: stores the value in the accel variable
• return: exits the loop and proceeds to the next step