Add initial source code, with passing test

.drone.yml

@@ -0,0 +1,9 @@
+kind: pipeline
+name: default
+
+steps:
+- name: test
+  image: swift:4.2
+  commands:
+  - swift build
+  - swift test

Package.swift

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+// swift-tools-version:4.2
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "drone-tutorial-swift",
+    products: [
+        // Products define the executables and libraries produced by a package, and make them visible to other packages.
+        .library(
+            name: "drone-tutorial-swift",
+            targets: ["drone-tutorial-swift"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
+        .target(
+            name: "drone-tutorial-swift",
+            dependencies: []),
+        .testTarget(
+            name: "drone-tutorial-swiftTests",
+            dependencies: ["drone-tutorial-swift"]),
+    ]
+)

README.md

@@ -1,3 +1,18 @@
-# drone-tutorial-swift
+# Drone Tutorial: Swift
 
 This is a swimple Swift project to observe the Drone Continuous Delivery platform in action.
+
+## Usage
+
+* Clone this project
+* Set up a corresponding project on the Drone-equipped Git platform you want to try.
+* Push the `master` branch to your own project.
+* Log into drone. You should see a build getting created and succeeding.
+* Push the `bad_test` branch to your own project.
+* You should see a drone build getting created, and failing in the `test` stage.
+
+## License
+
+This is `CC0` licensed. Adapt it to whatever purpose you want. Have fun.
+
+`microtherion@gmail.com` 2019-02-02

Sources/drone-tutorial-swift/drone_tutorial_swift.swift

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+struct drone_tutorial_swift {
+    var text = "Hello, World!"
+}

Tests/LinuxMain.swift

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+import XCTest
+
+import drone_tutorial_swiftTests
+
+var tests = [XCTestCaseEntry]()
+tests += drone_tutorial_swiftTests.allTests()
+XCTMain(tests)

Tests/drone-tutorial-swiftTests/XCTestManifests.swift

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+import XCTest
+
+#if !os(macOS)
+public func allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(drone_tutorial_swiftTests.allTests),
+    ]
+}
+#endif

Tests/drone-tutorial-swiftTests/drone_tutorial_swiftTests.swift

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+import XCTest
+@testable import drone_tutorial_swift
+
+final class drone_tutorial_swiftTests: XCTestCase {
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(drone_tutorial_swift().text, "Hello, World!")
+    }
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}