Add CreateFile task

.gitignore

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+build/**
+Tasks/.build
+Tasks/.swiftpm

Tasks/Package.swift

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+// swift-tools-version:5.3
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "LocalPlugin",
+    products: [
+        .executable(
+            name: "create-file",
+            targets: ["CreateFile"]
+        ),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        .target(name: "CreateFile"),
+    ]
+)

Tasks/Sources/CreateFile/main.swift

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+import Foundation
+
+try "File created with a plugin".write(
+    to: URL(fileURLWithPath: "plugin-file.txt"),
+    atomically: true,
+    encoding: .utf8
+)
+print("File created with a plugin!")