Update readme

README.md

@@ -8,6 +8,11 @@ Implements Apple's macOS Design System in Flutter. Based on the official documen
   - [Resources](#resources)
 - [Layout](#layout)
   - [Scaffold](#scaffold)
+- [Buttons](#buttons)
+  - [Switch](#switch)
+- [Indicators](#indicators)
+  - [ProgressCircle](#progresscircle)
+  - [ProgressBar](#progressbar)
 
 ## Resources
 
@@ -16,8 +21,30 @@ Implements Apple's macOS Design System in Flutter. Based on the official documen
 
 # Layout
 ## Scaffold
-`Scaffold` provides a basic structure for laying out widgets in a way you would expect on macOS. You must specify a `body` as the main content area, and you can optionally provide a `sidebar` that will show to the left of `body`. The `sidebar` can be resized by grabbing the split and dragging left or right. See the documentation for all customization options.
+`Scaffold` provides a basic structure for laying out widgets in a way you would expect on macOS. 
+You must specify a `body` as the main content area, and you can optionally provide a `sidebar` 
+that will show to the left of `body`. The `sidebar` can be resized by grabbing the split and 
+dragging left or right. See the documentation for all customization options.
 
 <img src="https://imgur.com/e41j2aT.jpg" width="75%"/>
 
-<img src="https://imgur.com/jTPXGuq.gif" width="75%"/>
+<img src="https://imgur.com/jTPXGuq.gif" width="75%"/>
+
+# Buttons
+## Switch
+<img src="https://imgur.com/IBh5jkz.jpg" width="50%" height="50%"/>
+
+<img src="https://imgur.com/qK1VCVr.jpg" width="50%" height="50%"/>
+
+# Indicators
+## ProgressCircle
+A `ProgressCircle` can be either determinate or indeterminate. If indeterminate, Flutter's
+`CupertinoActivityIndicator` will be shown.
+
+<img src="https://imgur.com/hr3dHn9.jpg" width="50%" height="50%"/>
+
+<img src="https://imgur.com/NSbKqLK.gif" width="50%" height="50%"/>
+
+## ProgressBar
+
+<img src="https://imgur.com/tdYgJmB.jpg" width="50%" height="50%"/>