Upgrade zonetree

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.cs]
+
+# CA1051: Do not declare visible instance fields
+dotnet_diagnostic.CA1051.severity = none

.gitattributes

@@ -0,0 +1 @@
+* text=auto eol=lf

src/ZoneTree.FullTextSearch.Playground/Program.cs

@@ -1,28 +1,28 @@
-namespace ZoneTree.FullTextSearch.Playground;
+namespace ZoneTree.FullTextSearch.Playground;
 
 public sealed class Program
 {
-    static void Main(string[] args)
+  static void Main(string[] args)
+  {
+    using var app = new SearchEngineApp();
+    if (args.Length > 0)
     {
-        using var app = new SearchEngineApp();
-        if (args.Length > 0)
-        {
-            switch (args[0])
-            {
-                case "create":
-                    {
-                        app.CreateIndex(app.DefaultIndexPath, app.DefaultFilePattern, false);
-                        break;
-                    }
-                case "drop":
-                    {
-                        app.DropIndex(false);
-                        break;
-                    }
-            }
-            return;
-        }
-        app.Run();
+      switch (args[0])
+      {
+        case "create":
+          {
+            app.CreateIndex(app.DefaultIndexPath, app.DefaultFilePattern, false);
+            break;
+          }
+        case "drop":
+          {
+            app.DropIndex(false);
+            break;
+          }
+      }
+      return;
     }
+    app.Run();
+  }
 }