Add Lua Seed Script

[mkasberg]

Add a Lua "seed" script to the seeds folder. Basically, this would be an executable Lua file (with #!/usr/bin/env lua that parses some simple command-line arguments (like -h or -t, see other scripts as examples) and prints a sentence or two to the command line. It's intended to demonstrate how to parse command line arguments and print something to the console in Lua.

See CONTRIBUTING.md, and feel free to ask for help or clarification here.

As a rough example, see #26.

[dshah2012]

I can work on this one too. I had worked on this language for a small project few years back.

[dshah2012]

PR has been created and test have passed.

[mkasberg]

Thanks @dshah2012

Lua script added in #47