Add DocC documentation

[Copilot]

The repository had no DocC documentation.

Changes

• Added DocC comments to Swift source: Documented TimeIt class and public methods (log(_:entry:), complete(log:completion:)) with parameters, examples, and usage notes
• Created documentation catalog: Added TimeIt.docc/TimeIt.md with overview, key features, usage examples, and topic organization
• Updated Package.swift: Declared .docc directory as a resource
• Enhanced README: Added usage examples, installation instructions, and documentation generation guidance

Symbol Graph

Documentation can now be generated with:

swift package dump-symbol-graph

Example

In-code documentation is now available:

/// Logs an entry with a timestamp to a named log.
///
/// - Parameters:
///   - log: The name of the log to add this entry to.
///   - entry: A descriptive message for this log entry.
public static func log(_ log: String, entry: String)

Original prompt

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This section details on the original issue you should resolve

<issue_title>No DocC documentation</issue_title>
<issue_description>There is no DocC documentation in this repo.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes No DocC documentation #2

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[mikelrob]

LGTM 👍