Add functions to encrypt PDFs for pdf version 1.3

examples/js/annotations.js

@@ -0,0 +1,21 @@
+var doc = new jsPDF({
+    unit: "px",
+    format: [200, 300],
+    floatPrecision: 2,
+});
+
+doc.textWithLink("Click me!", 10, 10, {
+    url: "https://parall.ax/",
+});
+doc.createAnnotation({
+    type: "text",
+    title: "note",
+    bounds: {
+        x: 10,
+        y: 10,
+        w: 200,
+        h: 80
+    },
+    contents: "This is text annotation (closed by default)",
+    open: false
+});

examples/js/password.js

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+var doc = new jsPDF({
+    encryption: {
+        userPassword: "user",
+        ownerPassword: "owner",
+        userPermissions: ["print", "modify", "copy", "annot-forms"]
+        // try changing the user permissions granted
+    }
+});
+
+doc.setFontSize(40);
+doc.text("Octonyan loves jsPDF", 35, 25);
+doc.addImage("examples/images/Octonyan.jpg", "JPEG", 15, 40, 180, 180);