Update CLI documentation

[aabounegm]

Closes #96.
Just like #112, this should be merged the last to avoid any conflicts.

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PR-Codex overview

This PR focuses on improving the documentation and CLI options of the code.

Detailed summary

• Updated the README.md file to provide clearer instructions on how to use the code.
• Added information on alternative ways to pass the input expression file.
• Added information on the output options and how to specify the output file path.
• Updated the formatting and wording of the README.md file.
• Updated the formatting of the ruleset file.
• Updated the formatting and wording of the test cases in the ruleset file.

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