macOS support (#33)

* mac os support 1

* entitlements

* fix updateTrack bug

* clean

* throws on mac

* simplify structure

* lock

macos/livekit_client.podspec

@@ -0,0 +1,20 @@
+Pod::Spec.new do |s|
+  s.name                = 'livekit_client'
+  s.version             = '0.5.3'
+  s.summary             = 'Open source platform for real-time audio and video.'
+  s.description         = 'Open source platform for real-time audio and video.'
+  s.homepage            = 'https://livekit.io/'
+  s.license             = { :file => '../LICENSE' }
+  s.author              = { 'LiveKit' => 'contact@livekit.io' }
+  s.source              = { :path => '.' }
+  s.source_files        = 'Classes/**/*'
+  s.public_header_files = 'Classes/**/*.h'
+  s.platform            = :osx, '10.11'
+  # Flutter.framework does not contain a i386 slice.
+  s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES' }
+  s.swift_version       = '5.0'
+  s.static_framework    = true
+
+  s.dependency 'FlutterMacOS'
+  s.dependency 'WebRTC-SDK', '~> 92.4515'
+end