shells/murex: Add new port

Murex is a shell, like bash / zsh / fish / etc however Murex
supports improved features and an enhanced UX.

A non-exhaustive list features would include:

• Support for additional type information in pipelines, which can be used for complex data formats like JSON or tables. Meaning all of your existing UNIX tools to work more intelligently and without any additional configuration.

• Usability improvements such as in-line spell checking, context sensitive hint text that details a commands behavior before you hit return, and auto-parsing man pages for auto-completions on commands that don't have auto-completions already defined.

• Smarter handling of errors and debugging tools. For example try/catch blocks, line numbers included in error messages, STDOUT highlighted in red and script testing and debugging frameworks baked into the language itself.

WWW: https://murex.rocks