Add custom Text Field on creation and store the value of Tag in AEM 6.3 (Touch UI)

I found the solution to it

Added the new property under create tag

Step1:-

/apps/cq/tagging/gui/content/tags/createtag/jcr:content/body/items/form/items/wizard/items/createStep/items/fixedColumns/items/fixedC olumn1/items

<newtextproperty

                                                            granite:class="block"

                                                            granite:id="tagpimid"

                                                            jcr:primaryType="nt:unstructured"

                                                            sling:resourceType="granite/ui/components/coral/foundation/form/textfield"

                                                            fieldLabel="proerty"

                                                            name="newtagproperty"

                                                            required="{Boolean}true"/>

Step2:-

under /apps/cq/tagging/gui/content/tags/createtag/jcr:content/body/items/form

Change the action to new custom servlet

sling:resourceType="granite/ui/components/coral/foundation/form"

                    action="/bin/tagcommandcreateext"

Step3:-

I found that ootb component on dialog creation sends data  servlet /bin/tagcommand  that is com.day.cq.tagging.servlets.TagCommandServlet

so decode and copy this code to your servlet and remove all the unwanted code expect for createtag code

Step4:- under your new servlet which has servlet path with "/bin/tagcommandcreateext" 

private HtmlResponse createTag(TagManager tagManager, SlingHttpServletRequest request){

    ResourceResolver resourceResolver = null;

   Session session = null;

    Map<String, Object> subService = new HashMap<>();

            subService.put(ResourceResolverFactory.SUBSERVICE, SUB_SERVICE);

            resourceResolver = resourceResolverFactory.getServiceResourceResolver(subService);

            session = resourceResolver.adaptTo(Session.class);

  try {

                Tag tag = tagManager.createTag(tagID, request.getParameter("jcr:title"),

                        request.getParameter("jcr:description"));

               Node tagNode = session.getNode(tag.getPath());

                tagNode.setProperty("newtagproperty",

                  request.getParameter("newtagproperty"));

     session.save();

                return this.createResponse(200, type + " created", tag.getTagID(), tag.getPath());

            }...