Add initial configuration, tokens, and widgets for M3E components

- Introduced `.gitignore` and `.metadata` for apps and examples.
- Added Flutter/Dart analysis configurations (`analysis_options.yaml`).
- Implemented foundational tokens and themes for M3E (colors, shapes).
- Created base implementations for `IconButtonM3E` and `SplitButtonM3E`.
- Set up CI workflow (`ci.yaml`) to automate testing and analysis.

packages/loading_indicator_m3e/README.md

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+# loading_indicator_m3e
+
+Material 3 **Expressive** Loading Indicator for Flutter — a morphing polygon that continuously rotates and morphs between shapes (ported from Android's Material3 `LoadingIndicator`).
+
+Two configurations:
+- **Default** — container uses `secondaryContainer`, active indicator uses `primary`
+- **Contained** — container uses `primaryContainer`, active indicator uses `onPrimaryContainer`
+
+Token-aligned sizes:
+- Container: **48 × 48dp**
+- Active indicator size: **38dp**
+- Container shape: **full** (pill/circular) corners
+
+## Usage
+
+```dart
+import 'package:loading_indicator_m3e/loading_indicator_m3e.dart';
+
+// Default
+const LoadingIndicatorM3E();
+
+// Contained
+const LoadingIndicatorM3E(variant: LoadingIndicatorM3EVariant.contained);
+
+// Custom colors, custom polygon sequence
+LoadingIndicatorM3E(
+  color: Colors.teal,
+  polygons: const [
+    MaterialShapes.sunny,
+    MaterialShapes.cookie9Sided,
+    MaterialShapes.pill,
+  ],
+);
+```
+
+## Notes
+- The inner morph sequence and animation timings match the Compose implementation:
+  - Morph interval ~650ms, global rotation ~4666ms
+  - Active size is scaled to ~38dp inside the 48dp container to avoid clipping while rotating
+- Requires your monorepo `m3e_design` (for tokens) and `material_new_shapes` (for `RoundedPolygon` + `Morph` + `MaterialShapes`). The `pubspec.yaml` is set up with `path: ../...`.
+
+## Monorepo Layout
+
+```
+packages/
+  m3e_design/
+  material_new_shapes/
+  loading_indicator_m3e/
+```
+
+## Accessibility
+Pass `semanticLabel` and `semanticValue` to announce loading status if needed.
+
+## License
+- Android/Compose implementation © Google, Apache-2.0
+- This package MIT