Add Client Example In Readme File

Docs/SampleClient.md

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+## Build A Simple Opc Client
+Brief description or introduction of your project.
+## Table of Contents
+- [Overview](#overview)
+- [Getting Started](#getting-started)
+  - [OPC Configuration](#opc-configuration)
+  - [C# Project Setup](#c-project-setup)
+  - [Endpoint Configuration](#endpoint-configuration)
+- [Application Object and Client Configuration](#application-object-and-client-configuration)
+- [Security Configuration and Certificate Handling](#security-configuration-and-certificate-handling)
+- [Create Endpoint URL](#create-endpoint-url)
+- [Read Value from NodeId](#read-value-from-nodeid)
+- [Subscribe to NodeId Changes](#subscribe-to-nodeid-changes)
+
+## Overview
+Provide a high-level overview of your project. What does it do? What problem does it solve?
+
+
+## Create an OPC UA Client Using the Kep Server
+        1. Open the First OPC Configuration Manager and export the server certificate from the Certificate Section in the Configuration Manager.
+        2. After exporting certificates, import into  client certificate sections.
+        3. Create a C# project and install the nuget package of the Opc Foundation UA client.
+        4. Add an endpoint url in the OPCS configuration manager, choose your security mode, and update the Choose Network type.
+
+## Create Application Object First
+        ApplicationInstance application = new ApplicationInstance();
+        application.ApplicationName = "My OPC UA Client";
+        application.ApplicationType = ApplicationType.Client;    
+
+## Create Client Configuration
+
+        ApplicationConfiguration config = new ApplicationConfiguration();
+        config.ApplicationName = application.ApplicationName;
+        config.ApplicationType = application.ApplicationType;
+        config.ApplicationUri = Utils.Format(@"urn:{0}:{1}", System.Net.Dns.GetHostName(), application.ApplicationName);
+        config.ProductUri = "https://github.com/opcfoundation/UA-.NETStandard";
+        config.ClientConfiguration = new ClientConfiguration();
+        string currentDir = System.IO.Directory.GetCurrentDirectory();
+
+
+## Add Security Configuration Certificates
+        // add client certificate.
+        // First Save Certificate in particular Directory .
+        // and give path to it.
+
+        config.SecurityConfiguration = new SecurityConfiguration()
+            {
+
+                ApplicationCertificate= new CertificateIdentifier
+                {
+                    StoreType= @"Directory",
+                    StorePath= currentDir + @"/Cert/TrustedIssuer/",
+                    SubjectName= config.ApplicationUri
+                },
+                TrustedIssuerCertificates = new CertificateTrustList
+                {
+                    StoreType = @"Directory",
+                    StorePath = currentDir + @"/Cert/TrustedIssuer/",
+
+                },
+                TrustedPeerCertificates = new CertificateTrustList
+                {
+                    StoreType = @"Directory",
+                    StorePath = currentDir + @"/Cert/TrustedIssuer/",
+
+                },
+                RejectedCertificateStore = new CertificateStoreIdentifier
+                {
+                    StoreType = @"Directory",
+                    StorePath = currentDir + @"/Cert/TrustedIssuer/",
+
+                },
+                AutoAcceptUntrustedCertificates=true,
+                AddAppCertToTrustedStore = true,
+                RejectSHA1SignedCertificates=false,
+        };
+
+## Validate Path Of Certificate
+        config.Validate(ApplicationType.Client).GetAwaiter().GetResult();
+
+## Create Endpoint Url
+
+        var endpointUrl = "opc.tcp://localhost:49320";
+        var endpoint = new ConfiguredEndpoint(null, new EndpointDescription(endpointUrl), EndpointConfiguration.Create(config));
+
+
+        // create session with username and password
+        var session = Session.Create(config, endpoint, true, "MySession", 60000,
+                 new UserIdentity("username","password"),
+                null).Result;
+            session.KeepAliveInterval = 2000;
+
+## Read Value from NodeId
+        DataValue value = session.ReadValue("ns=2;s=Channel1.Device1.AI_MOV1_POS");
+
+## Subscribe From Nodeid
+        // Create a subscription object with a sampling interval of 1000 ms
+        Subscription subscription = new Subscription(session.DefaultSubscription) { PublishingInterval = 3000 };
+        session.AddSubscription(subscription);
+        subscription.Create();
+
+        // Create a monitored item for the tag with a sampling interval of 1000 ms
+        MonitoredItem monitoredItem = new MonitoredItem(subscription.DefaultItem)
+            {
+               StartNodeId = "ns=2;s=Channel1.Device1.AI_MOV1_POS",
+               AttributeId = Attributes.Value,
+               SamplingInterval = 1000
+            };
+        monitoredItem.Notification += OnMonitoredItemNotification;
+        subscription.AddItem(monitoredItem);
+        subscription.ApplyChanges();
+
+        // Handle the notification event when the value of the tag changes
+        void OnMonitoredItemNotification(MonitoredItem item, MonitoredItemNotificationEventArgs e)
+        {
+               dynamic value = e.NotificationValue;
+               Console.WriteLine("Value of tag " + value.Value.Value);
+        }