feat: Working on command-line documentation.

Sources/CliClient/Documentation.docc/CliClient.md

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+# ``CliClient``
+
+Derive a version for a command-line tool from git tags or a git sha.
+
+## Additional Resources
+
+[Github Repo](https://github.com/m-housh/swift-cli-version)
+
+## Overview
+
+This tool exposes several plugins that can be used to derive a version for a command line program at
+build time or by manually running the plugin. The version is generally derived from git tags,
+however it can be configured to run custom commands.
+
+## Articles
+
+- <doc:GettingStarted>
+- <doc:ManualPlugins>