chore: add top-level .prettierrc

This integrates better with editor tools.

Author: rasendubi

.eslintrc.js

@@ -78,14 +78,7 @@ module.exports = {
         message: "'setImmediate' unavailable in JavaScript. Use 'setTimeout(fn, 0)' instead",
       },
     ],
-    'prettier/prettier': [
-      'warn',
-      {
-        singleQuote: true,
-        trailingComma: 'all',
-        printWidth: 100,
-      },
-    ],
+    'prettier/prettier': ['warn'],
     'unused-imports/no-unused-imports': 'error',
   },
   overrides: [

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all",
+  "printWidth": 100
+}