974525 Modified the readme content for digital signature

Author: GowthamrajKumar25

Digital Signature/Add-a-digital-signature-to-an-existing-document/.NET/Add-a-digital-signature-to-an-existing-document/README.md

@@ -1,16 +1,46 @@
-# Digital Signature
+# Digital Signature with Syncfusion .NET Core PDF Library
+
+![Digital Signature Banner](https://www.syncfusion.com/content/images/banner/digital-signature.png)
+
+## Table of Contents
+- [Video Illustration](#video-illustration)
+- [Overview](#overview)
+- [Steps to add a digital signature to PDF files](#steps-to-add-a-digital-signature-to-pdf-files)
+  - [Step 1: Create a New Project](#step-1-create-a-new-project)
+  - [Step 2: Install NuGet Package](#step-2-install-nuget-package)
+  - [Step 3: Include Namespaces](#step-3-include-namespaces)
+  - [Step 4: Add Digital Signature Code](#step-4-add-digital-signature-code)
+- [GitHub Repository](#github-repository)
+- [NuGet Installation](#nuget-installation)
+- [Installer & License](#installer--license)
+- [Documentation](#documentation)
+
+## 📹 Video Illustration
+
+Watch this video to see how to digitally sign PDF files using Syncfusion .NET Core PDF Library:
+
+[![Watch the video](https://img.youtube.com/vi/dQw4w9WgXcQ/0.jpg)]()
+
+
+## Overview
 
 The Syncfusion® [.NET Core PDF library](https://www.syncfusion.com/document-processing/pdf-framework/net-core/pdf-library) offers powerful capabilities for creating, reading, and editing PDF documents. One of its robust features is the ability to apply digital signatures to PDF files, ensuring document authenticity, integrity, and security.
 
 ## Steps to add a digital signature to PDF files
 
 Follow these steps to digitally sign PDF files using the Syncfusion® library:
 
-Step 1: **Create a new project**: Start by creating a new C# Console Application project.
+### Step 1: Create a new project:
 
-Step 2: **Install the NuGet package**: Add the [Syncfusion.Pdf.Net.Core](https://www.nuget.org/packages/Syncfusion.Pdf.Net.Core/) package to your project from [NuGet.org](https://www.nuget.org/).
+Start by creating a new C# Console Application project.
 
-Step 3: **Include necessary namespaces**: Add the following namespaces in your `Program.cs` file:
+### Step 2: Install the NuGet package: 
+
+Add the [Syncfusion.Pdf.Net.Core](https://www.nuget.org/packages/Syncfusion.Pdf.Net.Core/) package to your project from [NuGet.org](https://www.nuget.org/).
+
+### Step 3: Include necessary namespaces:
+
+Add the following namespaces in your `Program.cs` file:
 
    ```csharp
    using Syncfusion.Pdf;
@@ -21,7 +51,9 @@ Step 3: **Include necessary namespaces**: Add the following namespaces in your `
    using Syncfusion.Pdf.Interactive;
    ```
 
-Step 4: **Add digital signature code**: Use the following code snippet in `Program.cs` to add a digital signature to a PDF file:
+### Step 4: Add digital signature code:
+
+Use the following code snippet in `Program.cs` to add a digital signature to a PDF file:
 
    ```csharp
    // Open the existing PDF document as a stream
@@ -65,7 +97,13 @@ Step 4: **Add digital signature code**: Use the following code snippet in `Progr
        imageStream.Dispose();
    }
    ```
+## GitHub Repository
+
+[![GitHub](https://raw.githubusercontent.com/github/explore/main/topics/github/github.png#gh-dark-mode-only)](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/Digital%20Signature/Add-a-digital-signature-to-an-existing-document/) [Syncfusion PDF Digital Signature Example](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/Digital%20Signature/Add-a-digital-signature-to-an-existing-document/)
+
+## NuGet Installation
+
+[![NuGet](https://img.shields.io/badge/NuGet-Package-004880?logo=nuget&logoColor=white)](https://www.nuget.org/packages/Syncfusion.Pdf.Net.Core) [Syncfusion.Pdf.Net.Core](https://www.nuget.org/packages/Syncfusion.Pdf.Net.Core)
 
-For a complete working example, visit the [GitHub repository](https://github.com/SyncfusionExamples/PDF-Examples/tree/master/Digital%20Signature/Add-a-digital-signature-to-an-existing-document/).
+## Installer & License
 
-More information about the digital signature can be found in this [documentation](https://help.syncfusion.com/document-processing/pdf/pdf-library/net/working-with-digitalsignature) section.