added xmlKeys to xmlcomponent

ts/docx/paragraph/style.ts

@@ -2,6 +2,10 @@ import {XmlComponent, Attributes} from "../xml-components";
 
 export class Style implements XmlComponent {
     private pStyle: Array<XmlComponent>;
+    
+    xmlKeys = {
+        pStyle: 'w:pStyle'
+    }
 
     constructor(type: string) {
         this.pStyle = new Array<XmlComponent>();