Initialize Swift learning repository with comprehensive examples and tests

[Copilot]

Converts empty repository into a functional Swift learning resource covering language fundamentals.

Implementation

• Swift Package structure with executable target and test suite
• HelloSwift.swift demonstrating 9 core concepts:
  • Variables/constants, data types, control flow
  • Functions, optionals, collections
  • Closures, structs, and classes
• BasicTests.swift with 11 unit tests covering string ops, arrays, optionals, and functional patterns
• README.md with setup instructions and learning path

Example Output

=== Welcome to Swift Learning! ===

--- Variables and Constants ---
Variable: Hello
Changed to: Hi
Constant: Swift

--- Optionals ---
Optional with value: John
Unwrapped: John
Optional set to nil: nil

The program runs interactively to demonstrate each concept, while tests validate core Swift patterns.

Original prompt

Repo for learning swift.

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