swift tutorial

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$ git clone https://github.com/jpsim/Yams
$ cd Yams
$ swift run --repl

  1> import Yams

  2> let yaml = try Yams.dump(object: ["foo": [1, 2, 3, 4], "bar": 3])
yaml: String = "bar: 3\nfoo:\n- 1\n- 2\n- 3\n- 4\n"

  3> print(yaml)
bar: 3
foo:
- 1
- 2
- 3
- 4

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// swift-tools-version: 5.7
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "swift_tutorial",
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
        // 新增
        .package(url: "https://github.com/jpsim/Yams.git", from: "5.0.5"),      
    ],
    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 this package depends on.
        .executableTarget(
            name: "swift_tutorial",
            dependencies: [
                //新增
                .product(name: "Yams",
                         package: "Yams"),               
            ]),
        .testTarget(
            name: "swift_tutorialTests",
            dependencies: ["swift_tutorial"]),
    ]
)