how to use ckeditor in html

<script src="https://cdn.ckeditor.com/ckeditor5/40.0.0/classic/ckeditor.js"></script>

<textarea class="form-control" name="description" id="description" rows="10"><?php echo openssl_decrypt($notes[$key]['description'],"AES-128-ECB",$enc_key);//base64_decode($notes[$key]['description']);?></textarea>

<script>              
    ClassicEditor
        .create( document.querySelector( '#description' ),
        {
          ckfinder: {
            //uploadUrl: '/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Files&responseType=json'
        },
      toolbar: {
       items: [
        'selectAll', 'undo', 'redo', 'bold', 'italic', 'blockQuote', 'link', 'heading', 'imageTextAlternative', 'toggleImageCaption', 'imageStyle:inline', 'imageStyle:alignLeft', 'imageStyle:alignRight', 'imageStyle:alignCenter', 'imageStyle:alignBlockLeft', 'imageStyle:alignBlockRight', 'imageStyle:block', 'imageStyle:side', 'imageStyle:wrapText', 'imageStyle:breakText', 'indent', 'outdent', 'numberedList', 'bulletedList', 'mediaEmbed', 'insertTable', 'tableColumn', 'tableRow', 'mergeTableCells'
    ],
    shouldNotGroupWhenFull: false
      },
        })
        .then( editor => {
       // console.log( Array.from( editor.ui.componentFactory.names()));
    })
    .catch( error => {
            console.error( error );
        });
</script>