Initial commit for Swift Preview package

.gitignore

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+.DS_Store
+/.build
+/Packages
+/*.xcodeproj
+xcuserdata/
+/.swiftpm

CONTRIBUTING.md

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+By submitting a pull request, you represent that you have the right to license
+your contribution to Apple and the community, and agree by submitting the patch
+that your contributions are licensed under the [Swift
+license](https://swift.org/LICENSE.txt).
+
+---
+
+Before submitting the pull request, please make sure you have [tested your
+changes](https://github.com/apple/swift/blob/master/docs/ContinuousIntegration.md)
+and that they follow the Swift project [guidelines for contributing
+code](https://swift.org/contributing/#contributing-code).

LICENSE.txt

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Package.swift

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+// swift-tools-version:5.1
+//===----------------------------------------------------------*- swift -*-===//
+//
+// This source file is part of the Swift Numerics open source project
+//
+// Copyright (c) 2019 Apple Inc. and the Swift Numerics project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+//
+//===----------------------------------------------------------------------===//
+
+import PackageDescription
+
+let package = Package(
+  name: "swift-preview",
+  products: [
+    .library(
+      name: "SwiftPreview",
+      targets: ["SwiftPreview"]),
+  ],
+  dependencies: [
+    .package(url: "https://github.com/apple/se-NNNN-package-name", from: "1.0.0"),
+  ],
+  targets: [
+    .target(
+      name: "SwiftPreview",
+      dependencies: ["SE_NNNN_PackageName"]),
+
+    .testTarget(
+      name: "SwiftPreviewTests",
+      dependencies: ["SwiftPreview"]),
+  ]
+)

README.md

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+# Swift Preview
+
+## Introduction
+
+
+### Included Submodules
+
+_Modules will be listed here as they are approved._
+
+- [SE_NNNN_PackageName: Package Title](https://github.com/apple/SE_NNNN_PackageName)
+
+## Usage
+
+To use the umbrella library in a Swift Package Manager project,
+add the following to your `Package.swift` file's dependencies:
+
+```swift
+.package(url: "https://github.com/apple/swift-preview.git", from: "0.0.0"),
+```
+
+> **Important:** The Swift Preview package is under continuous development, 
+  and maintains a major version of `0` to indicate that it is not intended to be source stable.
+  If you require source stability in your project, 
+  add the individual submodules instead of the `swift-preview` package.
+
+## Contributing
+
+Contributions to the Swift Preview package are welcomed and encouraged!
+New functionality is added through the [Swift Evolution process](https://github.com/apple/swift-evolution/blob/master/process.md),
+after being discussed in the [Swift forums](https://forums.swift.org/).
+Please see the [guide for Contributing to Swift](https://swift.org/contributing/) for information.
+
+To be a truly great community, Swift needs to welcome developers from all walks of life, 
+with different backgrounds, and with a wide range of experience. 
+A diverse and friendly community will have more great ideas, 
+more unique perspectives, and produce more great code. 
+We will work diligently to make the Swift community welcoming to everyone.
+
+To give clarity of what is expected of our members, 
+Swift has adopted the code of conduct defined by the Contributor Covenant. 
+This document is used across many open source communities, 
+and we think it articulates our values well. 
+For more, see the [Code of Conduct](https://swift.org/community/#code-of-conduct).

Sources/SwiftPreview/SwiftPreview.swift

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+//===----------------------------------------------------------*- swift -*-===//
+//
+// This source file is part of the Swift Numerics open source project
+//
+// Copyright (c) 2019 Apple Inc. and the Swift Numerics project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+//
+//===----------------------------------------------------------------------===//
+
+// Export the included libraries in order of acceptance here:
+
+@_exported import SE_NNNN_PackageName

Tests/SwiftPreviewTests/SwiftPreviewTests.swift

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+//===----------------------------------------------------------*- swift -*-===//
+//
+// This source file is part of the Swift Numerics open source project
+//
+// Copyright (c) 2019 Apple Inc. and the Swift Numerics project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+//
+//===----------------------------------------------------------------------===//
+
+import XCTest
+import SwiftPreview
+
+final class SwiftPreviewTests: XCTestCase {
+    func testNone() {
+        XCTAssertTrue(true)
+    }
+}