Add project files.

Library/WinAPI/Blur.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CMM.Library.WinAPI
+{
+    #region 透明背景
+    public enum AccentState
+    {
+        ACCENT_DISABLED = 0,
+        ACCENT_ENABLE_GRADIENT = 1,
+        ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
+        ACCENT_ENABLE_BLURBEHIND = 3,
+        ACCENT_INVALID_STATE = 4
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct AccentPolicy
+    {
+        public AccentState AccentState;
+        public int AccentFlags;
+        public int GradientColor;
+        public int AnimationId;
+    }
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct WindowCompositionAttributeData
+    {
+        public WindowCompositionAttribute Attribute;
+        public IntPtr Data;
+        public int SizeOfData;
+    }
+
+    public enum WindowCompositionAttribute
+    {
+        // ...
+        WCA_ACCENT_POLICY = 19
+        // ...
+    }
+    #endregion
+}