feat: Working on documentation

Sources/CliDocCore/Documentation.docc/CliDocCore.md

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+# ``CliDocCore``
+
+A framework for writing `cli` documentation in a way similar to `SwiftUI`, where
+your types conform to ``TextNode`` and implement a ``TextNode/body`` that
+returns a ``TextNode``, generally using the essential types described below.
+
+## Topics
+
+### Essentials
+
+- ``VStack``
+- ``HStack``
+- ``Section``
+- ``Group``
+- ``Empty``
+- ``AnyTextNode``
+
+### Styling
+
+- ``SectionStyle``
+- ``DefaultSectionStyle``
+- ``SectionConfiguration``
+- ``TextStyleConfiguration``
+
+### Base Protocols
+
+- ``TextNode``
+- ``TextNodeRepresentable``
+- ``TextStyle``
+- ``TextModifier``