Updated docs

.gitignore

+.idea/

doc/quick_start.md

 
 ```yaml
 dependencies:
-  zefyr: ^0.1.0
+  zefyr: ^0.3.0
 ```
 
 And run `flutter packages get` to install. This installs both `zefyr`
 
 ### Usage
 
-There are 3 main objects you would normally interact with in your code:
+There are 4 main objects you would normally interact with in your code:
 
 * `NotusDocument`, represents a rich text document and provides
   high-level methods for manipulating the document's state, like
 * `ZefyrEditor`, a Flutter widget responsible for rendering of rich text
   on the screen and reacting to user actions.
 * `ZefyrController`, ties the above two objects together.
+* `ZefyrScaffold`, allows embedding Zefyr toolbar into any custom layout.
+
+`ZefyrEditor` depends on presence of `ZefyrScaffold` somewhere up the widget tree.
 
 Normally you would need to place `ZefyrEditor` inside of a
 `StatefulWidget`. Shown below is a minimal setup required to use the
 
   @override
   Widget build(BuildContext context) {
-    return ZefyrEditor(
-      controller: _controller,
-      focusNode: _focusNode,
+    return ZefyrScaffold(
+      child: ZefyrEditor(
+        controller: _controller,
+        focusNode: _focusNode,
+      ),
     );
   }
 }