Add Swift section with JSONCKit link

[steelbrain]

JSONCKit is heavily inspired by the https://github.com/marcozac/go-jsonc implementation, see ATTRIBUTIONS.

It borrows tests from a bunch of different libs in the ecosystem. I'm using it in some of my own macOS apps, happy to share it with the ecosystem.

Edit: Here's a very simple program that'd use it

~/P/t/jsonc-parser ❯❯❯ tree
.
├── Package.resolved
├── Package.swift
└── Sources
    └── jsonc-parser
        └── main.swift

3 directories, 3 files
~/P/t/jsonc-parser ❯❯❯ cat Sources/jsonc-parser/main.swift
import Foundation
import JSONCKit

let inputData = FileHandle.standardInput.readDataToEndOfFile()

guard !inputData.isEmpty else {
    exit(0)
}

do {
    let jsonData = try JSONC.convertToData(inputData)
    FileHandle.standardOutput.write(jsonData)
} catch {
    FileHandle.standardError.write("Error: \(error.localizedDescription)\n".data(using: .utf8)!)
    exit(1)
}
~/P/t/jsonc-parser ❯❯❯ cat Package.swift
// swift-tools-version: 6.0

import PackageDescription

let package = Package(
    name: "jsonc-parser",
    platforms: [.macOS(.v10_15)],
    dependencies: [
        .package(url: "https://github.com/steelbrain/JSONCKit.git", from: "1.0.0"),
    ],
    targets: [
        .executableTarget(
            name: "jsonc-parser",
            dependencies: [.product(name: "JSONCKit", package: "JSONCKit")]
        ),
    ]
)
~/P/t/jsonc-parser ❯❯❯ echo '{ /* comment */ "key": "value" }' | swift run jsonc-parser
[1/1] Planning build
Building for debugging...
[1/1] Write swift-version--58304C5D6DBC2206.txt
Build of product 'jsonc-parser' complete! (0.10s)
{               "key": "value" }