<form method="POST" action="">
              <div class="card m-b-30">
                    <div class="card-body">
                       <h4 class="mt-0 header-title mb-4">Kategoriler</h4>
                       <div class="container mb-4">

                          <div class="storeCategoryArea">
                                        <input type="text" name="category[]"  class="form-control storeCategory">
                          </div>

                       </div>
                       <div class="form-group row">
                         <div class="col-lg-2">
                           <span class="btn btn-warning yeniKategoriEkle">Yeni Kategori Ekle</span>
                         </div>
                       </div>
                    </div>
                 </div>
</form>

$(".[COLOR=#D9DAE9][FONT=Open Sans][SIZE=2]yeniKategoriEkle[/SIZE][/FONT][/COLOR]").click(function(){
            $(".storeCategoryArea").append('<input type="text" name="category[]"  class="form-control storeCategory">');
});