Update and add example of adding image

demo/jspdf/basic.html

@@ -6,7 +6,7 @@
     <meta name="description" content="Example showing how to use TjsPDF">
     <meta name="author" content="silvioprog">
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.4.1/jspdf.min.js" integrity="sha256-tzkPfJgrAehd0mUYdxwWvn+TQrk2VjRJL/xP9iW5fhk=" crossorigin="anonymous"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/1.5.3/jspdf.min.js" integrity="sha512-ToRWKKOvhBSS8EtqSflysM/S7v9bB9V0X3B1+E7xo7XZBEZCPL3VX5SFIp8zxY19r7Sz0svqQVbAOx+QcLQSAQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
     <script src="js/basic.js"></script>
     <title>TjsPDF example</title>
     <style>
@@ -31,6 +31,7 @@
             <option value="lines">Lines</option>
             <option value="rectangles">Rectangles</option>
             <option value="triangles">Triangles</option>
+            <option value="image">Add Image</option>
           </select>
           <button type="button" class="btn btn-primary btn-lg btn-block" id="btDownload" disabled>Download</button>
         </div>