Made demo files into typescript files

demo/demo1.ts

@@ -0,0 +1,20 @@
+// Simple example to add text to a document
+// Import from 'docx' rather than '../build' if you install from npm
+import * as fs from "fs";
+import { Document, Packer, Paragraph, TextRun } from "../build";
+
+const doc = new Document();
+
+const paragraph = new Paragraph("Hello World");
+const institutionText = new TextRun("Foo Bar").bold();
+const dateText = new TextRun("Github is the best").tab().bold();
+paragraph.addRun(institutionText);
+paragraph.addRun(dateText);
+
+doc.addParagraph(paragraph);
+
+const packer = new Packer();
+
+packer.toBuffer(doc).then((buffer) => {
+    fs.writeFileSync("My Document.docx", buffer);
+});