Add a tool to build MatrixRustSDK. (#369)

Package.swift

@@ -1,17 +1,24 @@
-// swift-tools-version: 5.6
+// 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: "DesignKit",
-    platforms: [.iOS(.v14)],
+    name: "Element Swift",
+    platforms: [
+        .iOS(.v14),
+        .macOS(.v13)
+    ],
     products: [
-        .library(name: "DesignKit", targets: ["DesignKit"])
+        .library(name: "DesignKit", targets: ["DesignKit"]),
+        .executable(name: "tools", targets: ["Tools"])
     ],
     dependencies: [
         .package(url: "https://github.com/vector-im/element-design-tokens.git", exact: "0.0.3"),
-        .package(url: "https://github.com/siteline/SwiftUI-Introspect.git", from: "0.1.4")
+        .package(url: "https://github.com/siteline/SwiftUI-Introspect.git", from: "0.1.4"),
+        /* Command line tools dependencies */
+        .package(url: "https://github.com/apple/swift-argument-parser", from: "1.2.0"),
+        .package(url: "https://github.com/jpsim/Yams", from: "5.0.1")
     ],
     targets: [
         .target(name: "DesignKit",
@@ -22,6 +29,12 @@ let package = Package(
                 path: "DesignKit"),
         .testTarget(name: "DesignKitTests",
                     dependencies: ["DesignKit"],
-                    path: "DesignKitTests")
+                    path: "DesignKitTests"),
+        .executableTarget(name: "Tools",
+                          dependencies: [
+                              .product(name: "ArgumentParser", package: "swift-argument-parser"),
+                              .product(name: "Yams", package: "Yams")
+                          ],
+                          path: "Tools/Sources")
     ]
 )