docs: add code documentation

add swift-docc-plugin

Package.resolved

@@ -0,0 +1,24 @@
+{
+  "originHash" : "e05386fa6eab1ec6655fac00fb86639842bce2925cd3deaaac2890d577315650",
+  "pins" : [
+    {
+      "identity" : "swift-docc-plugin",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-docc-plugin",
+      "state" : {
+        "branch" : "main",
+        "revision" : "d80a059824dba4fcebe17913c72553cc4bc63422"
+      }
+    },
+    {
+      "identity" : "swift-docc-symbolkit",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/swiftlang/swift-docc-symbolkit",
+      "state" : {
+        "revision" : "b45d1f2ed151d057b54504d653e0da5552844e34",
+        "version" : "1.0.0"
+      }
+    }
+  ],
+  "version" : 3
+}

Package.swift

@@ -17,14 +17,20 @@ let package = Package(
     ],
     dependencies: [
 //        .package(url: "https://github.com/apple/swift-async-algorithms", from: "1.0.0"),
+        .package(url: "https://github.com/apple/swift-docc-plugin", branch: "main"),
     ],
     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: "LangGraph", dependencies: [
 //                .product(name: "AsyncAlgorithms", package: "swift-async-algorithms"),
-            ], resources: [ .process("Resources")]),
+            ], 
+            resources: [ .process("Resources")]
+//            plugins: [
+//                .plugin(name: "Swift-DocC", package: "swift-docc-plugin")
+//            ]
+        ),
         .testTarget(
             name: "LangGraphTests",
             dependencies: ["LangGraph"]),