chore: add .editorconfig

.editorconfig

@@ -0,0 +1,21 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.py]
+indent_size = 4
+
+[*.sh]
+# options for shfmt(1)
+binary_next_line = true
+switch_case_indent = true
+
+[Makefile]
+indent_style = tab
+indent_size = unset