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/progress_indicator_m3e/README.md

@@ -0,0 +1,65 @@
+# progress_indicators_m3e
+
+Material 3 **Expressive** progress indicators for Flutter:
+
+- `LinearProgressM3E` — determinate, indeterminate, **buffer**, **query**, with **flat** or **wavy** shape
+- `CircularProgressM3E` — determinate & indeterminate, **flat** or **wavy** stroke (animated for indeterminate)
+- `ProgressWithLabelM3E` — compose a linear bar with inline/top/bottom/center labels
+
+All widgets read **M3E tokens** (`m3e_design`) for color, sizing, and typography.
+
+## Defaults (from the spec illustrations)
+
+- Linear: default thickness 4dp; configurable via `size` or `strokeHeight`
+- Linear (wavy): `wavelength=40dp`, `amplitude≈height/3`, **4dp** left/right inset
+- Circular: small/medium/large diameters ≈ 24/32/48 with stroke ≈ 3/4/6
+- Circular (wavy): default **10 waves** around the circle, amplitude ≈ 35% of stroke
+
+## Quick start
+
+```dart
+import 'package:progress_indicators_m3e/progress_indicators_m3e.dart';
+
+// Linear (wavy, determinate)
+LinearProgressM3E(
+  value: 0.62,
+  shape: LinearBarShapeM3E.wavy,
+);
+
+// Circular (wavy, indeterminate)
+const CircularProgressM3E(
+  shape: CircularBarShapeM3E.wavy,
+);
+
+// Linear (buffer) flat
+LinearProgressM3E(
+  variant: LinearProgressM3EVariant.buffer,
+  value: 0.3,
+  bufferValue: 0.6,
+);
+
+// Circular (flat) with center label
+CircularProgressM3E(
+  value: 0.5,
+  showCenterLabel: true,
+);
+```
+
+## Monorepo layout
+
+```
+packages/
+  m3e_design/
+  progress_indicators_m3e/
+```
+
+`pubspec.yaml` references `../m3e_design`.
+
+## Accessibility
+
+- Provide `semanticLabel` and (for determinate) the widgets expose a numeric **value** for screen readers.
+- Indeterminate wavy animations use modest motion; gate the speed with a future `m3e_design.motion` flag if you support "reduce motion".
+
+## License
+
+MIT