[Enhancement] Collection+Empty extension (#18)

This PR contains the work done to implement the "isNotEmpty" property in the Collection+Empty extension.

Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Reviewed-on: #18

Sources/Core/Extensions/Collection+Empty.swift

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 }
+
+}