Add the same .editorconfig as in MonoDevelop.MSBuildEditor.

This is useful when working on this repo outside of the MSBuildEditor context.

.editorconfig

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+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Baseline
+[*]
+charset = utf-8
+indent_style = tab
+trim_trailing_whitespace = true
+max_line_length = 120
+
+# MSBuild
+[*.{csproj,proj,projitems,shproj,fsproj,target,props}]
+indent_style = space
+indent_size = 2
+
+# XML config files
+[*.{config,nuspec,resx}]
+indent_style = space
+indent_size = 2
+
+# Addin manifests
+[*.addin.xml]
+indent_style = space
+indent_size = 4
+
+# JSON files
+[*.json]
+indent_style = space
+indent_size = 2
+
+# F# files
+[*.{fs, fsx, fsi}]
+indent_style = space
+indent_size = 4
+
+# Dotnet code style settings:
+[*.{cs,vb}]
+
+# 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
+
+# CSharp code style settings:
+[*.cs]
+
+# spaces before parens
+csharp_space_between_method_declaration_name_and_open_parenthesis = true
+csharp_space_between_method_call_name_and_opening_parenthesis = true
+csharp_space_after_keywords_in_control_flow_statements = true
+
+# Newline settings
+csharp_new_line_before_open_brace = types,methods
+csharp_new_line_before_else = false
+csharp_new_line_before_catch = false
+csharp_new_line_before_finally = false
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+
+# Switch indentation
+csharp_indent_switch_labels = false
+
+# Prefer "var" everywhere it's apparent
+csharp_style_var_when_type_is_apparent = true:suggestion
+csharp_style_var_for_built_in_types = false:none
+csharp_style_var_elsewhere = false:none
+
+# 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 = true:none
+csharp_style_expression_bodied_indexers = true:none
+csharp_style_expression_bodied_accessors = true:none
+
+# 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