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>

Library/Sources/Public/Protocols/Bundleable.swift

@@ -0,0 +1,9 @@
+import Foundation
+
+public protocol Bundleable {
+
+    // MARK: Functions
+    
+    func url(forResource name: String?, withExtension ext: String?, subdirectory subpath: String?) -> URL?
+    
+}

Library/Sources/Public/Protocols/FileServicing.swift

@@ -0,0 +1,28 @@
+import Foundation
+
+public protocol FileServicing {
+    
+    // MARK: Computed
+    
+    var currentFolder: URL { get async }
+    
+    // MARK: Functions
+    
+    func copyFile(from source: URL, to destination: URL) async throws (FileServiceError)
+    func createFolder(at location: URL) async throws (FileServiceError)
+    func deleteItem(at location: URL) async throws (FileServiceError)
+    func isItemExists(at location: URL) async throws (FileServiceError) -> Bool
+    
+}
+
+// MARK: - Errors
+
+public enum FileServiceError: Error, Equatable {
+    case folderNotCreated
+    case itemAlreadyExists
+    case itemEmptyData
+    case itemNotCopied
+    case itemNotDeleted
+    case itemNotExists
+    case itemNotFileURL
+}