Add macOS support (#23)

* Add macOS support

* Update README

* Update to v0.2.0

* Document breaking changes

* Delete widget tests

darwin/nearby_service.podspec

@@ -0,0 +1,25 @@
+#
+# To learn more about a Podspec see http://guides.cocoapods.org/syntax/podspec.html.
+# Run `pod lib lint nearby_service.podspec` to validate before publishing.
+#
+Pod::Spec.new do |s|
+  s.name             = 'nearby_service'
+  s.version          = '0.0.1'
+  s.summary          = 'A new Flutter plugin project.'
+  s.description      = <<-DESC
+A new Flutter plugin project.
+                       DESC
+  s.homepage         = 'http://example.com'
+  s.license          = { :file => '../LICENSE' }
+  s.author           = { 'Your Company' => '[email protected]' }
+  s.source           = { :path => '.' }
+  s.source_files = 'Classes/**/*'
+  s.ios.dependency 'Flutter'
+  s.osx.dependency 'FlutterMacOS'
+  s.ios.deployment_target = '12.0'
+  s.osx.deployment_target = '10.14'
+
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386' }
+  s.swift_version = '5.0'
+end