iOS: Added custom theme feature

plugin.xml

@@ -53,6 +53,8 @@
 
         <!-- source-file -->
         <source-file src="src/ios/VeriffCordovaPlugin.swift" />
+        <source-file src="src/ios/Utils.swift" />
+
 
         <podspec>
             <config>

src/ios/Utils.swift

@@ -0,0 +1,30 @@
+import Foundation
+import UIKit
+extension UIColor {
+    convenience init(hexString: String, alpha: CGFloat = 1.0) {
+        let hexString: String = hexString.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
+        let scanner = Scanner(string: hexString)
+        if (hexString.hasPrefix("#")) {
+            scanner.scanLocation = 1
+        }
+        var color: UInt32 = 0
+        scanner.scanHexInt32(&color)
+        let mask = 0x000000FF
+        let r = Int(color >> 16) & mask
+        let g = Int(color >> 8) & mask
+        let b = Int(color) & mask
+        let red   = CGFloat(r) / 255.0
+        let green = CGFloat(g) / 255.0
+        let blue  = CGFloat(b) / 255.0
+        self.init(red:red, green:green, blue:blue, alpha:alpha)
+    }
+    func toHexString() -> String {
+        var r:CGFloat = 0
+        var g:CGFloat = 0
+        var b:CGFloat = 0
+        var a:CGFloat = 0
+        getRed(&r, green: &g, blue: &b, alpha: &a)
+        let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
+        return String(format:"#%06x", rgb)
+    }
+}

src/ios/VeriffCordovaPlugin.swift

@@ -9,11 +9,18 @@ import Veriff
     func launchVeriffSDK(command: CDVInvokedUrlCommand) {
         callbackId = command.callbackId! as String
         let sessionUrl = command.arguments[0] as! String
+        var configuration = VeriffSdk.Configuration()
+
+        if let veriffConfiguration: Dictionary<String,String> = command.arguments[1] as? Dictionary<String,String> {
+            let branding = VeriffSdk.Branding(themeColor: UIColor.init(hexString: veriffConfiguration["themeColor"]!))
+            configuration = VeriffSdk.Configuration(branding: branding)
+        }
+
         let veriff = VeriffSdk.shared
         veriff.delegate = self
-        veriff.startAuthentication(sessionUrl: sessionUrl)
+        veriff.startAuthentication(sessionUrl: sessionUrl, configuration: configuration)
     }
-
+        
     private func returnErrorToCordova(message: String) {
         self.commandDelegate!.send(
             CDVPluginResult(