docs(form-controls): add ngx-country-selector (#1683)

Author: jdegand

README.md

@@ -1493,6 +1493,7 @@ Current Angular version: [![npm version](https://badge.fury.io/js/%40angular%2Fc
 * [ngxsmk-tel-input](https://github.com/toozuuu/ngxsmk-tel-input) - An Angular telephone input component with country dropdown, flags, and robust validation/formatting.
 * [gradient-picker](https://github.com/acrodata/gradient-picker) - A powerful and beautiful gradient picker.
 * [ngxsmk-datepicker](https://github.com/toozuuu/ngxsmk-datepicker) - A modern, highly customizable Angular date range picker component.
+* [ngx-country-selector](https://github.com/evicio1/ngx-country-selector) - A sleek, customizable Angular Material country selector offering accessible dropdowns with flags, codes, local names, and more.
 
 ### JSON Forms