chore: add .editorconfig for consistent coding styles and formatting

Author: chemodun

.editorconfig

@@ -0,0 +1,13 @@
+[*.{cs,csx}]
+# Non-configurable behaviors
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+# Configurable behaviors
+# end_of_line = lf - there is no 'auto' with an .editorconfig
+indent_style = space
+indent_size = 2
+max_line_length = 140