feat: create initial package

.gitignore

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+.DS_Store
+/.build
+/Packages
+xcuserdata/
+DerivedData/
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+.netrc
+.vscode
+Package.resolved
+.swift-version

Package.swift

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+// swift-tools-version: 6.0
+
+import PackageDescription
+
+let package = Package(
+    name: "swift-numerics-differentiable",
+    products: [
+        .library(
+            name: "NumericsDifferentiable",
+            targets: ["NumericsDifferentiable"]
+        ),
+        .library(
+            name: "RealModuleDifferentiable",
+            targets: ["RealModuleDifferentiable"]
+        ),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/apple/swift-numerics", from: "1.0.2"),
+    ],
+    targets: [
+        .target(
+            name: "NumericsDifferentiable",
+            dependencies: [
+                .product(name: "Numerics", package: "swift-numerics"),
+                "RealModuleDifferentiable",
+            ]
+        ),
+        .target(
+            name: "RealModuleDifferentiable",
+            dependencies: [
+                .product(name: "RealModule", package: "swift-numerics"),
+            ]
+        ),
+        .testTarget(
+            name: "RealModuleDifferentiableTests",
+            dependencies: [
+                "RealModuleDifferentiable",
+            ]
+        ),
+    ]
+)

Sources/NumericsDifferentiable/Numerics.swift

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+// A module that re-exports Swift Numerics API and the Differentiable extensions to the Swift Numerics API
+@_exported import Numerics
+// Swift Numerics modules with Differentiable extensions
+@_exported import RealModuleDifferentiable
+// No differentiable implementations for the `ComplexModule` yet
+//@_exported import ComplexModuleDifferentiable

Sources/RealModuleDifferentiable/RealModule.swift

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+// Export the RealModule API from Swift Numerics which this module extends with `Differentiable` support
+@_exported import RealModule

Tests/RealModuleDifferentiableTests/RealModuleDifferentiableTests.swift

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+import Testing
+@testable import RealModuleDifferentiable
+
+@Test func example() async throws {
+    // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+}