Root folder creation (#2)

This PR contains the work done to create the root folder of a new project when executing the _colibri_ executable. In addition, some other work has been done:

* added the `ArgumentParser` package dependency to the package;
* implemented the `FileService` service in the _library_ target;
* implemented the `CreateRootFolderTask` task in the _library_ target;
* removed some unnecessary comments and boilerplate code;

Reviewed-on: #2
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Sources/Executable/Colibri.swift

@@ -4,10 +4,11 @@ import ColibriLibrary
 @main
 struct Colibri: AsyncParsableCommand {
     
-    // MARK: Functions
-    
-    func run() async throws {
-        // ...
-    }
+    // MARK: Properties
+
+    static let configuration = CommandConfiguration(
+        abstract: "The utility to manage your Hummingbird apps",
+        subcommands: [Create.self]
+    )
     
 }

Sources/Executable/Commands/Create.swift

@@ -0,0 +1,56 @@
+import ArgumentParser
+import ColibriLibrary
+import Foundation
+
+extension Colibri {
+    struct Create: AsyncParsableCommand {
+        
+        // MARK: Properties
+        
+        static let configuration = CommandConfiguration(
+            commandName: "create-project",
+            abstract: "Create a new, tailored Hummingbird app",
+            helpNames: .shortAndLong,
+            aliases: ["create"]
+        )
+        
+        @OptionGroup var options: Options
+
+        // MARK: Functions
+
+        mutating func run() async throws {
+            let fileService = FileService()
+            let createRootFolder = CreateRootFolderTask(fileService: fileService)
+
+            let rootFolder = try await createRootFolder(
+                name: options.name,
+                at: options.locationURL
+            )
+
+            print(rootFolder)
+        }
+
+    }
+}
+
+// MARK: - Options
+
+extension Colibri.Create {
+    struct Options: ParsableArguments {
+     
+        // MARK: Properties
+        
+        @Option(name: .shortAndLong)
+        var name: String
+        
+        @Option(name: .shortAndLong)
+        var location: String?
+        
+        // MARK: Computed
+        
+        var locationURL: URL? {
+            location.flatMap { URL(fileURLWithPath: $0) }
+        }
+
+    }
+}