Add documentation

README.md

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+<h1 align="center"><a href="https://github.com/alexmercerind/windows_taskbar">windows_taskbar</a></h1>
+<h4 align="center">Flutter plugin serving utilities related to Windows taskbar 💙</h4>
+
+## Install
+
+```yaml
+dependencies: 
+  windows_taskbar: ^0.0.1
+```
+
+## Demo
+
+Checkout the example Flutter application [here](https://github.com/alexmercerind/windows_taskbar/blob/master/example/lib/main.dart).
+
+![](https://github.com/alexmercerind/windows_taskbar/blob/assets/bMebejv57F.gif)
+![](https://github.com/alexmercerind/windows_taskbar/blob/assets/OdzgD1yqEO.gif)
+
+
+## Documentation
+
+**Set thumbnail toolbar**
+
+```dart
+WindowsTaskbar.setThumbnailToolbar(
+  [
+  ThumbnailToolbarButton(
+    ThumbnailToolbarAssetIcon('res/previous.ico'),
+      'Button 1',
+      () {},
+    ),
+    ThumbnailToolbarButton(
+      ThumbnailToolbarAssetIcon('res/pause.ico'),
+      'Button 2',
+      () {},
+      mode: ThumbnailToolbarButtonMode.disabled | ThumbnailToolbarButtonMode.dismissionClick,
+    ),
+    ThumbnailToolbarButton(
+      ThumbnailToolbarAssetIcon('res/next.ico'),
+      'Button 3',
+      () {},
+    ),
+  ],
+);
+```
+
+**Clear thumbnail toolbar**
+
+```dart
+WindowsTaskbar.clearThumbnailToolbar();
+```
+
+**Set progress mode**
+
+```dart
+WindowsTaskbar.setProgressMode(TaskbarProgressMode.indeterminate);
+```
+
+**Set progress**
+
+```dart
+WindowsTaskbar.setProgress(69, 100);
+```
+
+**Set thumbnail tooltip**
+
+```dart
+WindowsTaskbar.setThumbnailTooltip('Awesome Flutter window.);
+```
+
+## License
+
+GNU Lesser General Public License v2.1
+
+Copyright © 2021, Hitesh Kumar Saini <<saini123hitesh@gmail.com>>
+
+Contributions welcomed.
+