Add --only-config option, document default values in --help, add FAQ to README.md

[scottbooker]

This pull request primarily improves usability and documentation for the rmp-eval tool, clarifies command-line options, and adds new functionality for configuration-only checks. The README has been expanded with a comprehensive FAQ and updated option descriptions, while the main program now supports a new --only-config mode and validates option combinations to prevent user error.

Documentation improvements:

• Expanded the README.md with a detailed FAQ section explaining the sender/receiver threads, recommended CPU configuration, latency categories, PREEMPT_RT requirements, and more, making it easier for users to understand and correctly use the tool.
• Updated command-line option descriptions in README.md to include default values and clarify the behavior of each option, including the new --only-config flag.
• Added usage instructions for the new configuration-only mode to the README.md.

Command-line interface enhancements:

• Added the --only-config (-oc) option to the argument parser in source/main.cpp, allowing users to run only system configuration checks without performing timing tests.
• Updated argument descriptions in source/main.cpp to include default values for greater clarity.

Robustness and error handling:

• Implemented validation in source/main.cpp to prevent using --no-config and --only-config together, displaying an error and exiting if both are specified. Also, the program now exits immediately after configuration checks when --only-config is used.

Version update:

• Bumped the micro version from 0.0.2 to 0.0.3 in include/version.h to reflect these feature and documentation improvements.

[Copilot]

Pull Request Overview

This PR adds a new --only-config command-line option to allow users to run system configuration checks without starting timing tests, and enhances help text for existing options to document default values. It also bumps the version to 0.0.3.

• Added --only-config flag to run configuration checks only and exit
• Enhanced help text for all command-line options to show default values
• Added extensive FAQ section in README documenting tool usage and RMP integration

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
source/main.cpp	Implements --only-config flag, adds mutual exclusion check with --no-config, and enhances argument descriptions with default values
include/version.h	Bumps version from 0.0.2 to 0.0.3
README.md	Updates usage examples with new flag, adds default values to options list, and adds comprehensive FAQ section

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