Added .editorconfig (#13)

Added some basic rules from the Roslyn repo's .editorconfig with some minor extensions for naming conventions and spacing

.editorconfig

@@ -0,0 +1,76 @@
+# Based on the EditorConfig from Roslyn
+# top-most EditorConfig file
+root = true
+
+[*.cs]
+indent_style = tab
+
+# Sort using and Import directives with System.* appearing first
+dotnet_sort_system_directives_first = true
+# Avoid "this." and "Me." if not necessary
+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
+
+# Use language keywords instead of framework type names for type references
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# Suggest more modern language features when available
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+
+# Prefer "var" everywhere
+csharp_style_var_for_built_in_types = true:suggestion
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_elsewhere = true:suggestion
+
+# Prefer method-like constructs to have a block body
+csharp_style_expression_bodied_methods = false:none
+csharp_style_expression_bodied_constructors = false:none
+csharp_style_expression_bodied_operators = false:none
+
+# Prefer property-like constructs to have an expression-body
+csharp_style_expression_bodied_properties = when_on_single_line:suggestion
+csharp_style_expression_bodied_indexers = true:none
+csharp_style_expression_bodied_accessors = when_on_single_line:suggestion
+
+# Suggest more modern language features when available
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Newline settings
+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
+
+# Misc
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_between_parentheses = false
+csharp_preserve_single_line_statements = false
+csharp_preserve_single_line_blocks = true
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = no_change
+
+# Custom naming conventions
+dotnet_naming_rule.non_field_members_must_be_capitalized.symbols = non_field_member_symbols
+dotnet_naming_symbols.non_field_member_symbols.applicable_kinds = property,method,event,delegate
+dotnet_naming_symbols.non_field_member_symbols.applicable_accessibilities = *
+
+dotnet_naming_rule.non_field_members_must_be_capitalized.style = pascal_case_style
+dotnet_naming_style.pascal_case_style.capitalization = pascal_case
+
+dotnet_naming_rule.non_field_members_must_be_capitalized.severity = suggestion