refactor: add missing files

.prettierrc.json

@@ -0,0 +1,8 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all",
+  "printWidth": 120,
+  "semi": false,
+  "arrowParens": "avoid",
+  "spaceAfterFunction": false
+}

docs/formBuilder/options/persistDefaultFields.md

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+# persistDefaultFields
+
+When `persistDefaultFields` is enabled, `defaultFields` defined in the formBuilder options will not be removed when clearing all fields.
+
+## Usage
+
+```javascript
+var options = {
+  defaultFields: [
+    {
+      className: 'form-control',
+      label: 'Default Field',
+      placeholder: 'Enter your default field value',
+      name: 'default-field-1',
+      type: 'text',
+    },
+  ],
+  persistDefaultFields: true,
+}
+$(container).formBuilder(options)
+```
+
+## See it in Action
+
+<p data-height="494" data-theme-id="22927" data-embed-version="2" data-slug-hash="WNpZZVg" data-default-tab="result" data-user="kevinchappell" class="codepen"></p>