Add work plane property saving

StructureHelperCommon/Models/WorkPlanes/IWorkPlaneProperty.cs

@@ -0,0 +1,26 @@
+using StructureHelperCommon.Infrastructures.Interfaces;
+using StructureHelperCommon.Models.Shapes;
+using System;
+using System.Windows.Media;
+
+namespace StructureHelperCommon.Models.WorkPlanes
+{
+    /// <summary>
+    /// Implements properties of work plane
+    /// </summary>
+    public interface IWorkPlaneProperty : ISaveable, IRectangleShape
+    {
+        /// <summary>
+        /// Size of grid of work plane
+        /// </summary>
+        double GridSize { get; set; }
+        /// <summary>
+        /// Thickness of axis line
+        /// </summary>
+        double AxisLineThickness { get; set; }
+        /// <summary>
+        /// Thickness of lines of main grid
+        /// </summary>
+        double GridLineThickness { get; set; }
+    }
+}