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README.md

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-# PMSWPF
+# PMSWPF
+
+## OPC UA Service
+
+This project includes an OPC UA service implementation that provides the following functionalities:
+
+### Features
+- Connect to OPC UA servers
+- Browse nodes in the OPC UA address space
+- Read and write values from/to OPC UA nodes
+- Add subscriptions for monitoring node changes
+
+### Usage
+
+```csharp
+// Create an instance of the OPC UA service
+var opcUaService = new OpcUaService();
+
+// Connect to an OPC UA server
+await opcUaService.CreateSession("opc.tcp://localhost:4840");
+
+// Check connection status
+if (opcUaService.IsConnected())
+{
+    // Browse nodes
+    var rootNodeId = ObjectIds.RootFolder;
+    var references = opcUaService.BrowseNodes(rootNodeId);
+    
+    // Read a value
+    var value = opcUaService.ReadValue(someNodeId);
+    
+    // Write a value
+    opcUaService.WriteValue(someNodeId, newValue);
+    
+    // Add a subscription
+    var subscription = opcUaService.AddSubscription("MySubscription");
+}
+
+// Disconnect when done
+opcUaService.Disconnect();
+```
+
+### Testing
+
+Unit tests for the OPC UA service are included in the `DMS.Infrastructure.UnitTests` project. Run them using your preferred test runner.