ElectronNET.API: Move API code to subfolder

src/ElectronNET.API/API/Entities/ProgressBarOptions.cs

@@ -0,0 +1,17 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+
+namespace ElectronNET.API.Entities
+{
+    /// <summary>
+    /// 
+    /// </summary>
+    public class ProgressBarOptions
+    {
+        /// <summary>
+        /// Mode for the progress bar. Can be 'none' | 'normal' | 'indeterminate' | 'error' | 'paused'.
+        /// </summary>
+        [JsonConverter(typeof(StringEnumConverter))]
+        public ProgressBarMode Mode { get; set; }
+    }
+}