Unify ESLint and Prettier across xplat/yoga (#1335)

Summary: Pull Request resolved: https://github.com/facebook/yoga/pull/1335

Reviewed By: christophpurrer

Differential Revision: D47459866

fbshipit-source-id: fd6b4e4e2518d91968ac7180b32129b3f70edf88

.prettierrc.js

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+module.exports = {
+  arrowParens: 'avoid',
+  bracketSameLine: true,
+  bracketSpacing: false,
+  singleQuote: true,
+  trailingComma: 'all',
+};