Implemented VirtualPrinterDriver project

Common/VirtualPrinter.Agent.Core/Interfaces/IUserConfig.cs

@@ -0,0 +1,26 @@
+using JetBrains.Annotations;
+
+namespace VirtualPrinter.Agent.Core
+{
+    public interface IUserConfig
+    {
+        /// <summary>
+        /// The printer stored in the registry.
+        /// </summary>
+        [CanBeNull]
+        string RedirectPrinter { get; }
+
+        /// <summary>
+        /// The DPI value stored in the registry.
+        /// </summary>
+        /// <remarks>Initial value is null.</remarks>
+        double? UserRenderDpi { get; }
+
+        /// <summary>
+        /// The format that you choose on your client side stored in the registry.
+        /// </summary>
+        /// <remarks>Intital value is PDF</remarks>
+        [NotNull]
+        string Format { get; }
+    }
+}