Add Typesetter

Sources/SwiftUIMath/Internal/Helpers/Platform.swift

@@ -7,3 +7,25 @@ import SwiftUI
   typealias PlatformColor = NSColor
   typealias PlatformBezierPath = NSBezierPath
 #endif
+
+extension PlatformColor {
+  convenience init?(fromHexString hexString: String) {
+    self.init(hexString: hexString)
+  }
+
+  convenience init?(hexString: String) {
+    guard !hexString.isEmpty, hexString.hasPrefix("#") else { return nil }
+
+    var rgbValue = UInt64(0)
+    let scanner = Scanner(string: hexString)
+    scanner.charactersToBeSkipped = CharacterSet(charactersIn: "#")
+    guard scanner.scanHexInt64(&rgbValue) else { return nil }
+
+    self.init(
+      red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
+      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
+      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
+      alpha: 1.0
+    )
+  }
+}