Add branded default provider and enforced enrollment

src/SGU.CredentialProvider/ProviderTileIcon.cs

@@ -7,6 +7,7 @@ namespace SGU.CredentialProvider;
 internal static class ProviderTileIcon
 {
     public const int Size = 72;
+    public const int UserTileSize = 128;
 
     public static Bitmap Create()
     {
@@ -30,4 +31,29 @@ internal static class ProviderTileIcon
 
         return bitmap;
     }
+
+    public static Bitmap CreateUserTile()
+    {
+        Bitmap bitmap = new(UserTileSize, UserTileSize, PixelFormat.Format32bppArgb);
+        using Graphics graphics = Graphics.FromImage(bitmap);
+        graphics.SmoothingMode = SmoothingMode.AntiAlias;
+        graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
+        graphics.Clear(Color.FromArgb(0, 83, 155));
+
+        using Pen border = new(Color.FromArgb(190, 221, 241), 5f);
+        using Pen key = new(Color.White, 9f)
+        {
+            StartCap = LineCap.Round,
+            EndCap = LineCap.Round,
+            LineJoin = LineJoin.Round
+        };
+
+        graphics.DrawEllipse(border, 7, 7, 113, 113);
+        graphics.DrawEllipse(key, 25, 25, 43, 43);
+        graphics.DrawLine(key, 62, 62, 99, 99);
+        graphics.DrawLine(key, 82, 82, 95, 69);
+        graphics.DrawLine(key, 93, 93, 106, 80);
+
+        return bitmap;
+    }
 }