feat(swift): Add Swift SDK implementation

.github/workflows/swift.yml

@@ -0,0 +1,88 @@
+name: Swift SDK
+
+on:
+  push:
+    branches: [master, main]
+    paths:
+      - 'swift/**'
+      - 'meta/**'
+      - 'test-assets/**'
+      - '.github/workflows/swift.yml'
+    tags:
+      - 'v[0-9]+.[0-9]+.[0-9]+'
+  pull_request:
+    branches: [master, main]
+    paths:
+      - 'swift/**'
+      - 'meta/**'
+      - 'test-assets/**'
+      - '.github/workflows/swift.yml'
+
+permissions:
+  contents: read
+
+jobs:
+  test-macos:
+    name: Test Swift on macOS
+    runs-on: macos-14
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Show Swift version
+        run: swift --version
+
+      - name: Build
+        working-directory: swift
+        run: swift build -v
+
+      - name: Run tests
+        working-directory: swift
+        run: swift test -v
+
+  test-linux:
+    name: Test Swift on Linux
+    runs-on: ubuntu-latest
+
+    container:
+      image: swift:5.10
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Show Swift version
+        run: swift --version
+
+      - name: Build
+        working-directory: swift
+        run: swift build -v
+
+      - name: Run tests
+        working-directory: swift
+        run: swift test -v
+
+  lint:
+    name: Lint
+    runs-on: macos-14
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Build
+        working-directory: swift
+        run: swift build -v
+
+      # SwiftLint is typically used for linting Swift code
+      # Uncomment when swiftlint configuration is added
+      # - name: Install SwiftLint
+      #   run: brew install swiftlint
+      # 
+      # - name: Run SwiftLint
+      #   working-directory: swift
+      #   run: swiftlint lint --strict

swift/.gitignore

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+# Swift Package Manager
+.build/
+.swiftpm/
+Package.resolved
+
+# Xcode
+*.xcodeproj/
+*.xcworkspace/
+xcuserdata/
+*.playground/
+
+# DerivedData
+DerivedData/
+
+# Swift Package Manager support
+Packages/
+.packages/
+
+# IDE
+.idea/
+*.xcuserstate

swift/Package.swift

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+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "JSONStructure",
+    platforms: [
+        .macOS(.v10_15),
+        .iOS(.v13),
+        .tvOS(.v13),
+        .watchOS(.v6)
+    ],
+    products: [
+        .library(
+            name: "JSONStructure",
+            targets: ["JSONStructure"]),
+    ],
+    targets: [
+        .target(
+            name: "JSONStructure",
+            dependencies: []),
+        .testTarget(
+            name: "JSONStructureTests",
+            dependencies: ["JSONStructure"]),
+    ]
+)