Add prettier config.

Author: nedtwigg

prettier.config.cjs

@@ -0,0 +1,8 @@
+/** @type {import('prettier').Config} */
+module.exports = {
+  endOfLine: "lf",
+  semi: false,
+  singleQuote: false,
+  tabWidth: 2,
+  trailingComma: "es5",
+}