argust 0.1.0

Simple to use commandline parser for rust programs
Documentation 
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# Argust
A simple command line parser which will accept the vector of program arguments and return a sorted structure which can be used to direct execution of the program.

The command line is divided into three parts - 
* Arguments - args which represent either commands or parameters for the program. e.g. `cp test.rs test2.rs` here "test.rs" and "test2.rs" are the arguements.
* Switches - as the name described. These are switches which can modify the behaviour of program e.g. `cp test.rs test2.rs -f` here "-f" is a switch.
* Options - like switch options are modifiable parameters for the program and can be used to update default settings/ configurations e.g. `cp test.rs test2.rs --buffer-size=2048` here "--buffer-size=2048" updates the default copy buffer to use the value of 2048 instead.

# How to use
The usage is very straight forward.
```rust
    let args: Vec<String> = env::args().skip(1).collect();
    let command_set: CommandSet = commands::parse_input(args, None);

    // Use the values as required
    if let Some(command) = command_set.commands.first() {
        handle_command(command);
    } else {
        basic_commands::help();
    }
```