Renamed the Sources folder as Libraries.

Libraries/Foundation/Extensions/Bool+Init.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+public extension Bool {
+    
+    // MARK: Initialisers
+
+    /// Initialise a boolean primitive out of a given string.
+    /// - Parameter string: A string to initialise the boolean with.
+    init(_ string: String) {
+        let strings: [String] = [
+            .Constants.oneNumber,
+            .Constants.oneWord,
+            .Constants.true,
+            .Constants.yes
+        ]
+        
+        self = strings.contains(string.lowercased())
+    }
+    
+}
+
+// MARK: - String+Constants
+
+private extension String {
+    enum Constants {
+        static let yes = "yes"
+        static let `true` = "true"
+        static let oneWord = "one"
+        static let oneNumber = "1"
+    }
+}

Libraries/Foundation/Extensions/Bundle+LocalisationBundle.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+import Foundation
+
+public extension Bundle {
+    
+    // MARK: Functions
+    
+    /// Retrieve a localisation bundle for a given language code or identifier, if exist inside a certain bundle.
+    /// - Parameter languageCode: A string that represent a language code or identifier.
+    /// - Returns: A `Bundle` instance that contains localised resources based on a given language code or identifier.
+    /// - Throws: A `BundleError` error in case the localisation bundle for a given language code  or identifier is not found inside a certain bundle.
+    func localisation(for languageCode: String) throws -> Bundle {
+        guard
+            let path = path(forResource: languageCode, ofType: .ResourceType.localisationBundle),
+            let bundle = Bundle(path: path)
+        else {
+            throw BundleError.bundleNotFound
+        }
+        
+        return bundle
+    }
+
+}
+
+// MARK: - String+Constants
+
+private extension String {
+    enum ResourceType {
+        static let localisationBundle = "lproj"
+    }
+}

Libraries/Foundation/Extensions/Collection+Empty.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+public extension Collection {
+    
+    // MARK: Properties
+    
+    /// A Boolean value indicating whether a collection is not empty.
+    var isNotEmpty: Bool { !isEmpty }
+
+}

Libraries/Foundation/Extensions/Optional+Nil.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+public extension Optional {
+    
+    // MARK: Properties
+    
+    /// A Boolean value indicating whether an optional has not been set.
+    var isNil: Bool { self == nil }
+    
+    /// A Boolean value indicating whether an optional has been set.
+    var isNotNil: Bool { !isNil }
+    
+}

Libraries/Foundation/Extensions/String+Empty.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+public extension String {
+    
+    // MARK: Constants
+    
+    /// A string that represents an empty string.
+    static let empty = ""
+    
+    // MARK: Properties
+
+    /// A Boolean value indicating whether a string is not empty.
+    var isNotEmpty: Bool { !isEmpty }
+    
+}

Libraries/Foundation/Extensions/String+Localisation.swift

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+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftLibs open source project
+//
+// Copyright (c) 2023 Röck+Cöde VoF. and the SwiftLibs project authors
+// Licensed under the EUPL 1.2 or later.
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftLibs project authors
+//
+//===----------------------------------------------------------------------===//
+
+import Foundation
+
+public extension String {
+    
+    // MARK: Functions
+    
+    /// Localise a string based on a given language code or identifier in an specific bundle.
+    /// - Parameters:
+    ///   - languageCode: A string that represent a language code or identifier.
+    ///   - bundle: A bundle in which to retrieve a localisation bundle.
+    ///   - value: A default value to return if key is nil or if a localized string for key can't be found in the table.
+    ///   - table: The receiver's string table to search. In case of nil or an empty string, the method attempts to use the table in `Localizable.strings`.
+    /// - Returns: A localized version of the string in case it is found. Otherwise, it returns the original string or a default string, if provided.
+    func localise(
+        for languageCode: String,
+        in bundle: Bundle,
+        value: String? = nil,
+        table: String? = nil
+    ) -> String {
+        do {
+            return try bundle
+                .localisation(for: languageCode)
+                .localizedString(
+                    forKey: self,
+                    value: value,
+                    table: table
+                )
+        } catch {
+            return value ?? self
+        }
+    }
+    
+}

Libraries/Foundation/Extensions/TimeZone+Zone.swift

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+import Foundation
+
+public extension TimeZone {
+    
+    // MARK: Zones
+
+    /// A time zone indicating it is Greenwich Mean Time or UTC+0
+    static let gmt = TimeZone(secondsFromGMT: 0)
+    
+}