Added theme file for the OtpInput

Author: naveenkumar-sanjeevirayan

maui/src/Themes/SfOtpInputStyles.xaml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ResourceDictionary xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Syncfusion.Maui.Toolkit.Themes.SfOtpInputStyles"
+             xmlns:otpinput="clr-namespace:Syncfusion.Maui.Toolkit.OtpInput">
+
+  <Style TargetType="otpinput:SfOtpInput">
+    <Setter Property="TextColor" Value="{DynamicResource SfOtpInputTextColor}"/>
+    <Setter Property="InputBackground" Value="{DynamicResource SfOtpInputFilledBackground}"/>
+    <Setter Property="Stroke" Value="{DynamicResource SfOtpInputBorderDefault}"/>
+    <Setter Property="PlaceholderColor" Value="{DynamicResource SfOtpInputPlaceholderColor}"/>
+  </Style>
+</ResourceDictionary>

maui/src/Themes/SfOtpInputStyles.xaml.cs

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+using Microsoft.Maui.Controls;
+
+namespace Syncfusion.Maui.Toolkit.Themes;
+
+/// <summary>
+/// OtpEntryStyles provides a set of predefined styles for SfOtpInput control.
+/// </summary>
+[XamlCompilation(XamlCompilationOptions.Compile)]
+public partial class SfOtpInputStyles : ResourceDictionary
+{
+	/// <summary>
+	/// Initializes a new instance of the <see cref="SfOtpInputStyles"/> class.
+	/// </summary>
+	public SfOtpInputStyles()
+	{
+		InitializeComponent();
+	}
+}