add #font method to Run

ts/docx/run/index.ts

@@ -1,4 +1,5 @@
 import {XmlComponent, Attributes} from "../xml-components";
+import { RunFonts } from "./run-fonts";
 import {RunProperties} from "./properties";
 import {Bold, Italics} from "./formatting";
 import {Tab} from "./tab";
@@ -11,7 +12,6 @@ import {Underline} from "./underline"
 export class Run extends XmlComponent {
     private properties: RunProperties;
 
-
     constructor() {
         super("w:r");
         this.properties = new RunProperties();
@@ -72,4 +72,9 @@ export class Run extends XmlComponent {
         this.properties.push(new SuperScript());
         return this;
     }
-}
+
+    font(fontName: string): Run {
+        this.properties.push(new RunFonts(fontName));
+        return this;
+    }
+}