Add helper manual (-h) option

[noahra]

Currently, byteblitz lacks a built-in helper manual or usage guide accessible from the command line. This feature is essential for new users or even experienced users who need a quick reference to the tool's functionalities and command syntax. Implementing a -h or --help option would greatly enhance user experience and accessibility.

Feature Request:

I propose adding a -h or --help option to byteblitz. This option should display a concise yet comprehensive guide on how to use byteblitz, including:

A brief description of what byteblitz does.
A list of all available commands and their functionalities.
Examples of common usage scenarios.
Information about other available flags and options (e.g., format switching).

Expected Outcome:

Users can type byteblitz -h or byteblitz --help to access the help manual.
The manual provides clear, useful information that enhances the user experience.
Improved accessibility and ease of use, particularly for new users.
Additional Considerations:

The help manual should be easy to read and well-formatted for command-line display.
It should be kept up-to-date with the latest features and changes in byteblitz.

[arthurbacci]

Pandoc can be used to generate a text file (for the --help) and a man page (for man) from a Markdown file. It may be useful to execute man if it's available on the system (and if byteblitz's manual page is found), since it allows scrolling, searching, etc.