Add .editorconfig to fix C# language server configuration warnings

Resolves parsing errors for dotnet_member_insertion_location and
dotnet_property_generation_behavior by providing proper enum values
instead of numeric strings.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.editorconfig

@@ -0,0 +1,45 @@
+root = true
+
+# All files
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# C# specific settings
+[*.cs]
+# Code style rules
+dotnet_member_insertion_location = with_other_members_of_the_same_kind
+dotnet_property_generation_behavior = prefer_throwing_properties
+
+# Formatting rules
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+
+# Python files
+[*.py]
+indent_size = 4
+
+# YAML files
+[*.{yml,yaml}]
+indent_size = 2
+
+# JavaScript/TypeScript files
+[*.{js,ts,tsx,jsx}]
+indent_size = 2
+
+# JSON files
+[*.json]
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+EOF < /dev/null