Updated installation instructions for zefyr package

packages/zefyr/README.md

@@ -7,10 +7,41 @@ request or found a bug, please file it at the [issue tracker][].
 
 [issue tracker]: https://github.com/memspace/zefyr/issues
 
-> **Important:** Zefyr currently tracks latest development version of
-> Flutter (`master` branch) and may not work with Flutter beta channel
-> if there are breaking changes.
-
 For documentation see [https://github.com/memspace/zefyr](https://github.com/memspace/zefyr).
 
 ![zefyr screenshot](https://github.com/memspace/zefyr/raw/master/packages/zefyr/zefyr.png)
+
+## Installation
+
+Official releases of Zefyr can be installed from Dart's Pub package repository.
+
+> Note that versions from Pub track stable channel of Flutter. If you are on master channel
+> check out instructions below in this document.
+
+
+To install Zefyr from Pub add `zefyr` package as a dependency to your `pubspec.yaml`:
+
+```yaml
+dependencies:
+  zefyr: [latest_version]
+```
+
+And run `flutter packages get`.
+
+#### Installing version of Zefyr compatible with master channel of Flutter.
+
+You need to add git dependency to your pubspec.yaml that points to `flutter-master` branch:
+
+```yaml
+dependencies:
+  zefyr:
+    git:
+      url: https://github.com/memspace/zefyr.git
+      ref: flutter-master
+      path: packages/zefyr
+```
+
+And run `flutter packages get`.
+
+Continue to [https://github.com/memspace/zefyr/blob/master/doc/quick_start.md](documentation) to
+learn more about Zefyr and how to use it in your projects.