Add editorconfig

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+[*]
+# Most of the standard properties are supported
+indent_size=2
+max_line_length=180
+
+# Most frequently used .NET-coding-convention properties are supported
+csharp_space_between_parentheses=expressions, type_casts, control_flow_statements
+csharp_style_var_for_built_in_types=true
+
+# JetBrains Rider custom properties for code formatting styles
+resharper_csharp_brace_style=next_line
+resharper_csharp_blank_lines_around_invocable=2
+
+# JetBrains Rider custom properties for code syntax styles
+csharp_default_private_modifier=explicit
+braces_for_ifelse=not_required
+
+# JetBrains Rider custom properties for code inspections
+resharper_possible_null_reference_exception_highlighting=error
+resharper_replace_with_string_is_null_or_empty_highlighting=none