Add src and test

Author: welchi

.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+# Libraries should not include pubspec.lock, per https://dart.dev/guides/libraries/private-files#pubspeclock.
+/pubspec.lock
+**/doc/api/
+.dart_tool/
+.packages
+build/
+
+
+# Android related
+**/android/**/gradle-wrapper.jar
+**/android/.gradle
+**/android/captures/
+**/android/gradlew
+**/android/gradlew.bat
+**/android/local.properties
+**/android/**/GeneratedPluginRegistrant.java
+
+# iOS/XCode related
+**/ios/**/*.mode1v3
+**/ios/**/*.mode2v3
+**/ios/**/*.moved-aside
+**/ios/**/*.pbxuser
+**/ios/**/*.perspectivev3
+**/ios/**/*sync/
+**/ios/**/.sconsign.dblite
+**/ios/**/.tags*
+**/ios/**/.vagrant/
+**/ios/**/DerivedData/
+**/ios/**/Icon?
+**/ios/**/Pods/
+**/ios/**/.symlinks/
+**/ios/**/profile
+**/ios/**/xcuserdata
+**/ios/.generated/
+**/ios/Flutter/App.framework
+**/ios/Flutter/Flutter.framework
+**/ios/Flutter/Flutter.podspec
+**/ios/Flutter/Generated.xcconfig
+**/ios/Flutter/app.flx
+**/ios/Flutter/app.zip
+**/ios/Flutter/flutter_assets/
+**/ios/Flutter/flutter_export_environment.sh
+**/ios/Flutter/.last_build_id
+**/ios/ServiceDefinitions.json
+**/ios/Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!**/ios/**/default.mode1v3
+!**/ios/**/default.mode2v3
+!**/ios/**/default.pbxuser
+!**/ios/**/default.perspectivev3
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 84a1e904f44f9b0e9c4510138010edcc653163f8
+  channel: stable
+
+project_type: package

CHANGELOG.md

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+## 0.0.1
+- Initial release.

README.md

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+nested_reorderable_list
+A Flutter package that provides a widget to create a nested reorderable list.
+
+## Getting Started
+This package provides a stateless widget, NestedReorderableList, which allows you to create a list with drag-and-drop item reordering functionality. This widget supports nested lists, meaning that list items can have their own children, which can also be reordered.
+
+## Usage
+First, you'll need to add nested_reorderable_list to your pubspec.yaml:
+```yaml
+dependencies:
+  flutter:
+    sdk: flutter
+
+  nested_reorderable_list: ^0.1.0
+```
+
+Then, import the package in your Dart file:
+```dart
+import 'package:nested_reorderable_list/nested_reorderable_list.dart';
+```
+
+Here's a basic example of how to use the NestedReorderableList widget:
+```dart
+NestedReorderableList<String>(
+  dragAndDropItems: items,
+  itemBuilder: (BuildContext context, DragAndDropItem<String> item) => Text(item.content),
+  onReorder: (SourceLocation source, DestinationLocation destination, DragAndDropItem<String> movedItem) {
+    // Handle the reordering logic here.
+  },
+);
+```
+
+In the example above, items is a list of DragAndDropItem instances, each of which contains a key for identification, the content of the item, and a list of child DragAndDropItem instances (if any). The itemBuilder is a function that takes a BuildContext and a DragAndDropItem and returns a Widget that represents the item. The onReorder function is called when a drag-and-drop operation finishes; it receives a SourceLocation and a DestinationLocation, which represent the initial and final locations of the dragged item, respectively.
+
+## License
+This project is licensed under the MIT License - see the LICENSE file for details.

analysis_options.yaml

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+include: package:flutter_lints/flutter.yaml
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

lib/nested_reorderable_list.dart

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+export 'src/nested_reorderable_list.dart';