chore(config): add .editorconfig and .gitattributes

.editorconfig

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+# EditorConfig - https://editorconfig.org
+
+root = true
+
+# All files
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = crlf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+# XML files
+[*.{xml,csproj,props,targets,nuspec}]
+indent_size = 2
+
+# JSON/YAML files
+[*.{json,yml,yaml}]
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+
+# C# files
+[*.cs]
+# Organize usings
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+# this. preferences
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# Language keywords vs BCL types preferences
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = for_non_interface_members:suggestion
+dotnet_style_readonly_field = true:suggestion
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:silent
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary:silent
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = true:suggestion
+dotnet_style_prefer_compound_assignment = true:suggestion
+dotnet_style_prefer_simplified_interpolation = true:suggestion
+dotnet_style_prefer_simplified_boolean_expressions = true:suggestion
+
+# Null-checking preferences
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+
+# var preferences
+csharp_style_var_for_built_in_types = false:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = false:suggestion
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = when_on_single_line:suggestion
+csharp_style_expression_bodied_constructors = false:suggestion
+csharp_style_expression_bodied_operators = when_on_single_line:suggestion
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_indexers = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
+csharp_style_expression_bodied_lambdas = true:suggestion
+csharp_style_expression_bodied_local_functions = when_on_single_line:suggestion
+
+# Pattern matching preferences
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_prefer_switch_expression = true:suggestion
+csharp_style_prefer_pattern_matching = true:suggestion
+csharp_style_prefer_not_pattern = true:suggestion
+
+# Code-block preferences
+csharp_prefer_braces = true:suggestion
+csharp_prefer_simple_using_statement = true:suggestion
+
+# 'using' directive preferences
+csharp_using_directive_placement = outside_namespace:suggestion
+
+# New line preferences
+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
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = one_less_than_current
+csharp_indent_block_contents = true
+csharp_indent_braces = false
+csharp_indent_case_contents_when_block = false
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_parentheses = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_declaration_name_and_open_parenthesis = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_after_comma = true
+csharp_space_before_comma = false
+csharp_space_after_dot = false
+csharp_space_before_dot = false
+csharp_space_after_semicolon_in_for_statement = true
+csharp_space_before_semicolon_in_for_statement = false
+csharp_space_around_declaration_statements = false
+csharp_space_before_open_square_brackets = false
+csharp_space_between_empty_square_brackets = false
+csharp_space_between_square_brackets = false
+
+# Wrapping preferences
+csharp_preserve_single_line_statements = false
+csharp_preserve_single_line_blocks = true
+
+# Naming conventions
+dotnet_naming_rule.private_fields_should_be_camel_case_with_underscore.severity = suggestion
+dotnet_naming_rule.private_fields_should_be_camel_case_with_underscore.symbols = private_fields
+dotnet_naming_rule.private_fields_should_be_camel_case_with_underscore.style = camel_case_with_underscore
+
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+
+dotnet_naming_style.camel_case_with_underscore.capitalization = camel_case
+dotnet_naming_style.camel_case_with_underscore.required_prefix = _

.gitattributes

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+# Auto detect text files and normalize line endings
+* text=auto eol=crlf
+
+# C# source files
+*.cs text eol=crlf
+
+# Project files
+*.csproj text eol=crlf
+*.sln text eol=crlf
+*.slnx text eol=crlf
+
+# Config files (use LF for cross-platform tools)
+*.md text eol=lf
+*.yml text eol=lf
+*.yaml text eol=lf
+*.json text eol=lf
+*.sh text eol=lf