read me

Author: ay42

README.md

@@ -36,6 +36,15 @@ Chart(data: [0.1, 0.3, 0.2, 0.5, 0.4, 0.9, 0.1])
     )
 ```
 
+### Stacked Area
+
+```swift
+Chart(data: matrix)
+    .chartStyle(
+        StackedAreaChartStyle(.quadCurve, colors: [.yellow, .orange, .red])
+    )
+```
+
 ### Column
 <center>
 <img src="Resources/columnChart.png"/>
@@ -48,6 +57,15 @@ Chart(data: [0.1, 0.3, 0.2, 0.5, 0.4, 0.9, 0.1])
     )
 ```
 
+### Stacked Column
+
+```swift
+Chart(data: matrix)
+    .chartStyle(
+        StackedColumnChartStyle(spacing: 2, colors: [.yellow, .orange, .red])
+    )
+```
+
 ## SDKs
 - iOS 13+
 - Mac Catalyst 13.0+