Add SwiftTrie package

Package.swift

@@ -0,0 +1,27 @@
+// 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: "SwiftTrie",
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "SwiftTrie",
+            targets: ["SwiftTrie"])
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        .package(url: "https://github.com/apple/swift-docc-plugin.git", from: "1.3.0")
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .target(
+            name: "SwiftTrie"),
+        .testTarget(
+            name: "SwiftTrieTests",
+            dependencies: ["SwiftTrie"])
+    ]
+)