title: ngx-select-dropdown example value not binding
body: <p>can any one give example for     ngx-select-dropdown  value and options array  example  </p>
  
  <pre><code>&lt;ngx-select-dropdown [config]="config" [options]="dropdownOptions" 
                             [(value)]="dataModel" [multiple]="false" &gt;&lt;/ngx-select-dropdown&gt;
  </code></pre>