Add help

[FloVanGH]

Add help command and print the help to the output.

command

cargo node help

output

Cargo node commands:
    build        Compile the current project
    clear        Clear the cargo node targets
    deploy       Deploy the current project
...

[madmas]

The readme mentions a config file that can be put next to Cargo.toml - but should be the name of that file?

[FloVanGH]

@madmas The name should be Node.toml