T158 added option to add and remove headers as will

src/main/resources/templates/mock.html

@@ -59,6 +59,7 @@
                                 <tr>
                                     <td class="tableHead">Header</td>
                                     <td class="tableHead">Value</td>
+                                    <td></td>
                                 </tr>
                             </thead>
                             <tbody id="httpStatusValues">
@@ -67,6 +68,7 @@
                                 <tr>
                                     <td><input type="text" name="headerKey" id="headerKeyInput" placeholder="key" class="tableField"/></td>
                                     <td><input type="text" name="headerValue" id="headerValueInput" placeholder="value" class="tableField"/></td>
+                                    <td id="btn-addRow" onclick="addRow()" class="btn-function-table btn-table-add">+</td>
                                 </tr>
                             </tfoot>
 <!--                        <input type="text" name="headerValue" id="headerValue" class="headerField" placeholder="value"/>-->