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thirdparty/CLI11/docs/mainpage.md

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+# Introduction {#mainpage}
+
+This is the Doxygen API documentation for CLI11 parser. There is a friendly introduction to CLI11 on the [Github page](https://github.com/CLIUtils/CLI11), and [a tutorial series](https://cliutils.github.io/CLI11/book/).
+
+The main classes are:
+
+| Name          | Where used                          |
+|---------------|-------------------------------------|
+|CLI::Option    | Options, stored in the app          |
+|CLI::App       | The main application or subcommands |
+|CLI::Validator | A check that can affect the type name |
+|CLI::Formatter | A subclassable formatter for help printing |
+|CLI::ExitCode  | A scoped enum with exit codes       |
+|CLI::Timer     | A timer class, only in CLI/Timer.hpp (not in `CLI11.hpp`) |
+|CLI::AutoTimer | A timer that prints on deletion     |
+
+
+Groups of related topics:
+
+| Name                 | Description                                    |
+|----------------------|------------------------------------------------|
+| @ref error_group     | Errors that can be thrown                      |
+| @ref validator_group | Common validators used in CLI::Option::check() |
+
+
+