Setting up dev env and project structure

.editorconfig

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+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{json,yml,yaml,nix,csproj,props,targets,slnx,xml}]
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[*.cs]
+# Namespaces and usings
+csharp_style_namespace_declarations = file_scoped:warning
+csharp_using_directive_placement = outside_namespace:warning
+dotnet_sort_system_directives_first = true
+
+# Language preferences
+dotnet_style_qualification_for_field = false:warning
+dotnet_style_qualification_for_property = false:warning
+dotnet_style_qualification_for_method = false:warning
+dotnet_style_predefined_type_for_locals_parameters_members = true:warning
+csharp_style_var_for_built_in_types = false:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = false:suggestion
+csharp_prefer_braces = true:warning
+csharp_style_expression_bodied_methods = when_on_single_line:suggestion
+csharp_style_prefer_primary_constructors = true:suggestion
+dotnet_style_readonly_field = true:warning
+
+# Formatting
+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
+
+# Naming: interfaces start with I, private fields start with _
+dotnet_naming_rule.interfaces_begin_with_i.symbols = interfaces
+dotnet_naming_rule.interfaces_begin_with_i.style = begins_with_i
+dotnet_naming_rule.interfaces_begin_with_i.severity = warning
+dotnet_naming_symbols.interfaces.applicable_kinds = interface
+dotnet_naming_style.begins_with_i.required_prefix = I
+dotnet_naming_style.begins_with_i.capitalization = pascal_case
+
+dotnet_naming_rule.private_fields_underscore.symbols = private_fields
+dotnet_naming_rule.private_fields_underscore.style = underscore_camel
+dotnet_naming_rule.private_fields_underscore.severity = warning
+dotnet_naming_symbols.private_fields.applicable_kinds = field
+dotnet_naming_symbols.private_fields.applicable_accessibilities = private
+dotnet_naming_style.underscore_camel.required_prefix = _
+dotnet_naming_style.underscore_camel.capitalization = camel_case
+
+# Tests: allow underscores in method names (Method_Scenario_Expected)
+[tests/**/*.cs]
+dotnet_diagnostic.CA1707.severity = none