docs: Add PageView widget documentation

website/docs/widgets/page_view.md

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+# PageView
+
+The Mirai PageView allows you to build a Flutter PageView widget using JSON.
+To know more about the PageView widget in Flutter, refer to the [official documentation](https://api.flutter.dev/flutter/widgets/PageView-class.html).
+
+## Properties
+
+| Property               | Type                         | Description                                                                   |
+|------------------------|------------------------------|-------------------------------------------------------------------------------|
+| scrollDirection        | `Axis`                       | The axis along which the page view scrolls. Defaults to `Axis.horizontal`.    |
+| reverse                | `bool`                       | Whether the page view scrolls in the reverse direction. Defaults to `false`.  |
+| physics                | `MiraiScrollPhysics?`        | The physics for the scroll view.                                              |
+| pageSnapping           | `bool`                       | Whether the page view should snap to page boundaries. Defaults to `true`.     |
+| onPageChanged          | `Map<String, dynamic>?`      | The callback that is called when the page changes.                            |
+| dragStartBehavior      | `DragStartBehavior`          | The drag start behavior. Defaults to `DragStartBehavior.start`.               |
+| allowImplicitScrolling | `bool`                       | Whether to allow implicit scrolling. Defaults to `false`.                     |
+| restorationId          | `String?`                    | The restoration ID to save and restore the scroll offset.                     |
+| clipBehavior           | `Clip`                       | The clip behavior of the page view. Defaults to `Clip.hardEdge`.              |
+| padEnds                | `bool`                       | Whether to pad the ends of the page view. Defaults to `true`.                 |
+| initialPage            | `int`                        | The initial page to show. Defaults to `0`.                                    |
+| keepPage               | `bool`                       | Whether to save the current page. Defaults to `true`.                         |
+| viewportFraction       | `double`                     | The fraction of the viewport that each page should occupy. Defaults to `1.0`. |
+| children               | `List<Map<String, dynamic>>` | The widgets below this widget in the tree. Defaults to an empty list.         |
+
+## Example JSON
+
+```json
+{
+  "type": "pageView",
+  "children": [
+    {
+      "type": "container",
+      "color": "#D9D9D9",
+      "child": {
+        "type": "center",
+        "child": {
+          "type": "text",
+          "data": "Page 1",
+          "style": {
+            "fontSize": 23,
+            "fontWeight": "w400"
+          }
+        }
+      }
+    },
+    {
+      "type": "container",
+      "color": "#FC3F1B",
+      "child": {
+        "type": "center",
+        "child": {
+          "type": "text",
+          "data": "Page 2",
+          "style": {
+            "fontSize": 23,
+            "fontWeight": "w400"
+          }
+        }
+      }
+    },
+    {
+      "type": "container",
+      "color": "#D9D9D9",
+      "child": {
+        "type": "center",
+        "child": {
+          "type": "text",
+          "data": "Page 3",
+          "style": {
+            "fontSize": 23,
+            "fontWeight": "w400"
+          }
+        }
+      }
+    }
+  ]
+}
+```