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>

Test/Sources/Helpers/Spies/FileServiceSpy.swift

@@ -0,0 +1,51 @@
+import Foundation
+
+@testable import ColibriLibrary
+
+final class FileServiceSpy {
+    
+    // MARK: Properties
+    
+    private(set) var actions: [Action] = []
+    
+}
+
+// MARK: - FileServicing
+
+extension FileServiceSpy: FileServicing {
+
+    var currentFolder: URL {
+        get async { .someCurrentFolder }
+    }
+    
+    func copyFile(from source: URL, to destination: URL) async throws (FileServiceError) {
+        actions.append(.fileCopied(source, destination))
+    }
+    
+    func createFolder(at location: URL) async throws (FileServiceError) {
+        actions.append(.folderCreated(location))
+    }
+    
+    func deleteItem(at location: URL) async throws (FileServiceError) {
+        actions.append(.itemDeleted(location))
+    }
+    
+    @discardableResult
+    func isItemExists(at location: URL) async throws (FileServiceError) -> Bool {
+        actions.append(.itemExists(location))
+
+        return .random()
+    }
+    
+}
+
+// MARK: - Action
+
+extension FileServiceSpy {
+    enum Action: Equatable {
+        case fileCopied(_ source: URL, _ destination: URL)
+        case folderCreated(_ location: URL)
+        case itemDeleted(_ location: URL)
+        case itemExists(_ location: URL)
+    }
+}