Change demo26 to typescript

demo/demo26.ts

@@ -0,0 +1,22 @@
+// Creates two paragraphs, one with a border and one without
+// Import from 'docx' rather than '../build' if you install from npm
+import * as fs from "fs";
+import { Document, Packer, Paragraph } from "../build";
+
+const doc = new Document();
+
+const paragraph = new Paragraph("No border!");
+
+doc.addParagraph(paragraph);
+
+const borderParagraph = new Paragraph("I have borders on my top and bottom sides!").createBorder();
+borderParagraph.Borders.addTopBorder();
+borderParagraph.Borders.addBottomBorder();
+
+doc.addParagraph(borderParagraph);
+
+const packer = new Packer();
+
+packer.toBuffer(doc).then((buffer) => {
+    fs.writeFileSync("My Document.docx", buffer);
+});