Update .gitignore to exclude TypeScript build info and add dist directory. Expand README with project overview, technology stack, prerequisites, and instructions for running and testing the application.

.editorconfig

@@ -0,0 +1,42 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = crlf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+
+[*.{cs,csx}]
+indent_size = 4
+
+# Namespaces and usings
+csharp_style_namespace_declarations = file_scoped:warning
+dotnet_sort_system_directives_first = true
+csharp_using_directive_placement = outside_namespace:warning
+
+# Expression preferences
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = true:suggestion
+csharp_prefer_braces = true:warning
+csharp_style_prefer_primary_constructors = true:suggestion
+dotnet_style_prefer_collection_expression = true:suggestion
+
+# Naming: private fields are _camelCase
+dotnet_naming_rule.private_fields_underscore.severity = warning
+dotnet_naming_rule.private_fields_underscore.symbols = private_fields
+dotnet_naming_rule.private_fields_underscore.style = underscore_prefix
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+dotnet_naming_style.underscore_prefix.required_prefix = _
+dotnet_naming_style.underscore_prefix.capitalization = camel_case
+
+[*.{ts,js,mts,cts,json,jsonc,css,html,yml,yaml}]
+indent_size = 2
+
+[*.{csproj,props,targets,slnx}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false