Add formatting with prettier (which is confusing because I usually use xo for styling. But I'll figure something out in the future.

Author: chrisspiegl

.prettierrc.cjs

@@ -0,0 +1,7 @@
+module.exports = {
+  tabWidth: 2,
+  useTabs: false,
+  semi: false,
+  singleQuote: true,
+  printWidth: Infinity,
+}