Update Task+Disposable.swift

Add copyright and documentation

Author: Louis Debaere

MobiusCore/Source/Disposables/Task+Disposable.swift

@@ -1,6 +1,28 @@
+// Copyright 2019-2024 Spotify AB.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 @available(macOS 10.15, iOS 13.0, watchOS 6.0, tvOS 13.0, *)
 public extension Task {
 
+    /// A disposable for use with `EffectHandler` that will cancel the task
+    ///
+    ///     func handle(_ parameters: Void, _ callback: EffectCallback<Event>) -> Disposable {
+    ///         Task {
+    ///
+    ///         }
+    ///        .asDisposable
+    ///     }
     var asDisposable: any Disposable {
         AnonymousDisposable { cancel() }
     }