build: add Prettier configuration

prettier.config.js

@@ -0,0 +1,15 @@
+// prettier.config.js, .prettierrc.js, prettier.config.cjs, or .prettierrc.cjs
+
+/**
+ * @see https://prettier.io/docs/en/configuration.html
+ * @type {import("prettier").Config}
+ */
+const config = {
+  trailingComma: "none",
+  tabWidth: 2,
+  semi: true,
+  singleQuote: false,
+  endOfLine: "lf"
+};
+
+module.exports = config;