Add editor config

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{ts,js}]
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

README.md

@@ -124,7 +124,7 @@ cd javascript
 
 ## Formatting
 
-Run `npm run format` or install an editor plugin like https://github.com/prettier/prettier-vscode.
+Run `npm run format` or install an editor plugin like https://github.com/prettier/prettier-vscode and https://marketplace.visualstudio.com/items?itemName=EditorConfig.EditorConfig
 
 ## Linting