Made demo files into typescript files

demo/demo5.ts

@@ -0,0 +1,21 @@
+// Example of how to add images to the document - You can use Buffers, UInt8Arrays or Base64 strings
+// 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("Hello World");
+doc.addParagraph(paragraph);
+
+doc.createImage(fs.readFileSync("./demo/images/image1.jpeg"));
+doc.createImage(fs.readFileSync("./demo/images/dog.png").toString("base64"));
+doc.createImage(fs.readFileSync("./demo/images/cat.jpg"));
+doc.createImage(fs.readFileSync("./demo/images/parrots.bmp"));
+doc.createImage(fs.readFileSync("./demo/images/pizza.gif"));
+
+const packer = new Packer();
+
+packer.toBuffer(doc).then((buffer) => {
+    fs.writeFileSync("My Document.docx", buffer);
+});