Add math run and fraction

src/file/paragraph/math/math-text.ts

@@ -0,0 +1,9 @@
+import { XmlComponent } from "file/xml-components";
+
+export class MathText extends XmlComponent {
+    constructor(readonly text: string) {
+        super("m:t");
+
+        this.root.push(text);
+    }
+}