repository: add editorconfig dotfile (#5)

.editorconfig

@@ -0,0 +1,13 @@
+# top level config
+root = true
+
+[*.{kt,kts,pork}]
+# text encoding settings
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+
+# indentation settings
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true