support text shadow

docs/figma-shadow-effect.md

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+# Figma shadow effects
+
+![](https://static.figma.com/uploads/9def6cce093b164306328ee228028155d13d72d0)
+
+[figma DropShadowEffect](https://www.figma.com/plugin-docs/api/Effect/#dropshadoweffect)
+
+## text
+
+The text shadow is handled as the shadow of the effect from figma.
+
+### drop-shadow
+
+**css**
+
+- [`text-shadow`](https://developer.mozilla.org/en-US/docs/Web/CSS/text-shadow)
+
+**syntax**
+
+1. offsetX offsetY blurRadius color
+2. color offsetX offsetY blurRadius
+3. offsetX offsetY color
+4. color offsetX offsetY
+
+```css
+text-shadow: 1px 1px 2px #ff2;
+text-shadow: 1px 1px 2px red, 0 0 1em blue, 0 0 0.2em blue;
+```
+
+**flutter**
+
+- [`Shadow`](https://api.flutter.dev/flutter/dart-ui/Shadow-class.html)
+
+```dart
+Shadow(
+  offset: Offset(10.0, 10.0),
+  blurRadius: 3.0,
+  color: Color.fromARGB(255, 0, 0, 0),
+)
+```