iOS screen share (#133)

example/ios/Runner/Info.plist

@@ -2,6 +2,12 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>RTCScreenSharingExtension</key>
+	<string>io.livekit.example.flutter.LiveKit-Broadcast-Extension</string>
+	<key>RTCAppGroupIdentifier</key>
+	<string>group.io.livekit.example.flutter</string>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleExecutable</key>
@@ -49,7 +55,5 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
-	<key>CADisableMinimumFrameDurationOnPhone</key>
-	<true/>
 </dict>
 </plist>

example/ios/Runner/Runner.entitlements

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.application-groups</key>
+	<array>
+		<string>group.io.livekit.example.flutter</string>
+	</array>
+</dict>
+</plist>