Add macOS support (#23)

* Add macOS support

* Update README

* Update to v0.2.0

* Document breaking changes

* Delete widget tests

darwin/Classes/Utils/Logger.swift

@@ -0,0 +1,15 @@
+//
+//  Logger.swift
+//  nearby_service
+//
+//  Created by Kseniia Nikitina on 26/1/24.
+//
+
+import Foundation
+
+
+class Logger {
+    static func error(message: String) {
+        NSLog("NearbyServicePluginError -- %@", message)
+    }
+}