feat: Parser for jenny

packages/flame_jenny/README.md

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+# flame_jenny
+
+The **flame_jenny** library integrates `jenny` (a dialogue framework) into the Flame engine. It
+offers a number of components for displaying conversations within a game.
+
+The `jenny` library, inspired by [YarnSpinner], is a framework for embedding dialogues, interactive
+conversations, narratives, or step-by-step tutorials.
+
+[YarnSpinner]: https://yarnspinner.dev/

packages/flame_jenny/jenny/README.md

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+# Jenny
+
+The **jenny** library supports building *dialogues*, interactive *conversations*, *narratives*,
+or non-linear *story-telling*. The dialogue itself is written in a simple text-based Yarn language.
+The `jenny` library allows you to load these `yarn` files into a YarnProject and then present this
+dialogue to users within a game or an app.
+
+The `jenny` library mimics the features and functionality of the [Yarn Spinner] library for Unity.
+
+
+[Yarn Spinner]: https://docs.yarnspinner.dev/

packages/flame_jenny/jenny/lib/jenny.dart

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+export 'src/errors.dart' show SyntaxError, NameError, TypeError;
+export 'src/yarn_project.dart' show YarnProject;

packages/flame_jenny/jenny/lib/src/errors.dart

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+class SyntaxError implements Exception {
+  SyntaxError([this.message]);
+
+  final String? message;
+
+  @override
+  String toString() => 'SyntaxError: $message';
+}
+
+/// This error is emitted when accessing an unknown name, such as: undefined
+/// variable name, unknown node title, unrecognized function, unspecified
+/// command, etc.
+class NameError implements Exception {
+  NameError([this.message]);
+
+  final String? message;
+
+  @override
+  String toString() => 'NameError: $message';
+}
+
+class TypeError implements Exception {
+  TypeError([this.message]);
+
+  final String? message;
+
+  @override
+  String toString() => 'TypeError: $message';
+}