Basic project creation (#3)

This PR contains the work done to create a new *Hummingbird* project with very basic configuration from the _colibri_ executable, just like the project you could create with the [Hummingbird template](https://github.com/hummingbird-project/template) project in Github.

Reviewed-on: #3
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Executable/Sources/Colibri.swift

@@ -0,0 +1,13 @@
+import ArgumentParser
+
+@main
+struct Colibri: AsyncParsableCommand {
+    
+    // MARK: Properties
+
+    static let configuration = CommandConfiguration(
+        abstract: "The utility to manage your Hummingbird apps",
+        subcommands: [Create.self]
+    )
+    
+}

Executable/Sources/Commands/CreateCommand.swift

@@ -0,0 +1,39 @@
+import ArgumentParser
+import ColibriLibrary
+
+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 copyFiles = CopyFilesTask(fileService: fileService)
+            let createFolders = CreateFoldersTask(fileService: fileService)
+            let createRootFolder = CreateRootFolderTask(fileService: fileService)
+            let initGitInFolder = InitGitInFolderTask()
+
+            let rootFolder = try await createRootFolder(
+                name: options.name,
+                at: options.locationURL
+            )
+            
+            try await createFolders(at: rootFolder)
+            try await copyFiles(to: rootFolder)
+            try await initGitInFolder(at: rootFolder)
+        }
+
+    }
+}

Executable/Sources/Options/CreateOptions.swift

@@ -0,0 +1,22 @@
+import ArgumentParser
+import Foundation
+
+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) }
+        }
+        
+    }
+}