fix: add example to the flutter_link_previewer

Author: demchenkoalex

packages/flutter_link_previewer/example/README.md

@@ -0,0 +1,57 @@
+```dart
+import 'package:flutter/material.dart';
+import 'package:flutter_link_previewer/flutter_link_previewer.dart';
+import 'package:flutter_chat_core/flutter_chat_core.dart' show LinkPreviewData;
+
+class MyChatBubble extends StatefulWidget {
+  const MyChatBubble({super.key, required this.message});
+
+  final String message;
+
+  @override
+  State<MyChatBubble> createState() => _MyChatBubbleState();
+}
+
+class _MyChatBubbleState extends State<MyChatBubble> {
+  LinkPreviewData? _linkPreviewData;
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.all(16),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Text(widget.message),
+          LinkPreview(
+            // The text that should be parsed to find the first URL
+            text: widget.message,
+            // Pass the cached preview data to avoid re-fetching
+            linkPreviewData: _linkPreviewData,
+            // Callback to store the fetched preview data
+            onLinkPreviewDataFetched: (data) {
+              setState(() {
+                _linkPreviewData = data;
+              });
+            },
+            // For a chat bubble, you would pass the message text here
+            // to align the preview with the text bubble.
+            parentContent: widget.message,
+            // Customization example
+            borderRadius: 4,
+            sideBorderColor: Colors.white,
+            sideBorderWidth: 4,
+            insidePadding: const EdgeInsets.fromLTRB(12, 8, 8, 8),
+            outsidePadding: const EdgeInsets.symmetric(vertical: 4),
+            titleTextStyle: const TextStyle(
+              fontWeight: FontWeight.bold,
+              fontSize: 20,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+```

packages/flutter_link_previewer/lib/src/link_preview.dart

@@ -469,7 +469,14 @@ class _LinkPreviewState extends State<LinkPreview>
   }
 }
 
-enum LinkPreviewImagePosition { bottom, side }
+/// The position of the image in the link preview.
+enum LinkPreviewImagePosition {
+  /// The image is displayed at the bottom of the preview.
+  bottom,
+
+  /// The image is displayed on the side of the preview.
+  side,
+}
 
 extension on LinkPreviewData {
   bool hasTitle({bool hide = false}) =>