:feat: support emphasis mark

src/file/paragraph/run/formatting.ts

@@ -1,5 +1,7 @@
 import { Attributes, XmlComponent } from "file/xml-components";
+
 export { Underline } from "./underline";
+export { EmphasisMark } from "./emphasis-mark";
 export { SubScript, SuperScript } from "./script";
 export { RunFonts } from "./run-fonts";