chore: add .editorfile file

Author: filzrev

.editorconfig

@@ -0,0 +1,30 @@
+root = true
+
+# All files
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+insert_final_newline = unset
+
+# JSON files
+[*.json]
+indent_size = 2
+
+# XML files
+[*.{xml,resx,ruleset}]
+indent_size = 2
+
+# .NET project files
+[*.{csproj,vbproj,props}]
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+
+# C# files
+[*.cs]
+csharp_style_namespace_declarations=file_scoped:suggestion