added shortcut guide settings (#2247)

src/core/Microsoft.PowerToys.Settings.UI.Lib/DoubleProperty.cs

@@ -0,0 +1,29 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.PowerToys.Settings.UI.Lib
+{
+
+    // Represents the configuration property of the settings that store Double type.
+    public class DoubleProperty
+    {
+        public DoubleProperty()
+        {
+            this.Value = 0.0;
+        }
+
+        // Gets or sets the double value of the settings configuration.
+        [JsonPropertyName("value")]
+        public double Value { get; set; }
+
+        // Returns a JSON version of the class settings configuration class.
+        public override string ToString()
+        {
+            return JsonSerializer.Serialize(this);
+        }
+    }
+}