chore: add prettier config (#633)

Signed-off-by: Rui Chen <rui@chenrui.dev>

.prettierrc.js

@@ -0,0 +1,11 @@
+/**
+ * @type {import('prettier').Config}
+ */
+module.exports = {
+  trailingComma: 'all',
+  tabWidth: 2,
+  semi: true,
+  singleQuote: true,
+  printWidth: 100,
+  bracketSpacing: true,
+};