Create flutter-for-ios.md (flutter#938)

* Create flutter-for-ios.md

* Remove double space

* Add a WIP notice at the top of the file

flutter-for-ios.md

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+---
+layout: page
+title: Flutter for iOS Developers
+permalink: /flutter-for-ios/
+---
+
+# This document is a work in progress
+We're working on this document right now. Please do not rely on its completeness
+and accuracy until it's finished and it's shown in the sidebar as a link.
+
+---
+
+This document is meant for iOS developers looking to apply their
+existing iOS knowledge to build mobile apps with Flutter. If you understand
+the fundamentals of the iOS framework then you can use this document as a
+jump start to Flutter development.
+
+Your iOS knowledge and skill set are highly valuable when building with
+Flutter, because Flutter relies on the mobile operating system for numerous
+capabilities and configurations. Flutter is a new way to build UIs for mobile,
+but it has a plugin system to communicate with iOS (and Android) for non-UI
+tasks. If you're an expert in iOS development, you don't have to relearn everything
+to use Flutter.
+
+This document can be used as a cookbook by jumping around and finding questions
+that are most relevant to your needs.
+
+* TOC Placeholder
+{:toc}