chore: create .editorconfig configuration (#25)

.editorconfig

@@ -0,0 +1,29 @@
+root = true
+; This file is for unifying the coding style for different editors and IDEs.
+; More information at http://EditorConfig.org
+
+[*]
+charset = utf-8
+
+[*.cs]
+indent_style = tab
+insert_final_newline = true
+max_line_length = off
+
+csharp_style_namespace_declarations = file_scoped
+
+dotnet_diagnostic.ide0161.severity = warning
+dotnet_diagnostic.NUnit1032.severity = suggestion
+dotnet_diagnostic.NUnit1028.severity = none
+dotnet_diagnostic.NUnit2045.severity = none
+
+# ReSharper properties
+resharper_default_private_modifier = implicit
+
+[*.csproj]
+indent_style = space
+indent_size = 2
+
+[*.props]
+indent_style = space
+indent_size = 2