docs: add ngx-multi-field-dropdown (#2221)

Author: jdegand

README.md

@@ -1564,6 +1564,7 @@ Current Angular version: [![npm version](https://badge.fury.io/js/%40angular%2Fc
 * [ngx-intl-phone-input](https://github.com/JoaoHenriqueAlmeida/ngx-intl-phone-input) - Accessible, headless Angular international phone input with CDK-powered country selector.
 * [ngx-colors2](https://github.com/DominicWrege/ngx-colors) - A material‑style Angular color‑picker updated for Angular 20+, using signals and no animation dependencies.
 * [ngx-signal-datetimepicker](https://github.com/dominikmodrzejewski99/ngx-signal-datetimepicker) - Angular datetime picker built on Signal Forms — date + time in one control, zero deps, WCAG 2.2 AAA out of the box.
+* [ngx-multi-field-dropdown](https://github.com/luismtapiab/ngx-multi-field-dropdown) - A customizable Angular searchable dropdown component with multi-field search support.
 
 ### JSON Forms