project: Added WireGuardIntentsExtensioniOS target and Siri capability

Signed-off-by: Alessio Nossa <alessio.nossa@gmail.com>

Sources/WireGuardIntentsExtension/IntentHandler.swift

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018-2021 WireGuard LLC. All Rights Reserved.
+
+import Intents
+
+class IntentHandler: INExtension {
+
+    override func handler(for intent: INIntent) -> Any {
+        // This is the default implementation.  If you want different objects to handle different intents,
+        // you can override this and return the handler you want for that particular intent.
+
+        return self
+    }
+
+}