Added demo14 to showcase differentFirstPageHeader and pagenumbers

demo/demo14.js

@@ -0,0 +1,23 @@
+const docx = require('../build');
+
+var doc = new docx.Document(undefined,{differentFirstPageHeader:true});
+
+doc.createParagraph("First Page").pageBreak()
+doc.createParagraph("Second Page");
+
+var pageNumber = new docx.TextRun().pageNumber()
+
+var pageoneheader = new docx.Paragraph("First Page Header ").right();
+
+pageoneheader.addRun(pageNumber);
+doc.firstPageHeader.addParagraph(pageoneheader);
+
+var pagetwoheader = new docx.Paragraph("My Title ").right();
+
+pagetwoheader.addRun(pageNumber)
+doc.Header.addParagraph(pagetwoheader)
+
+var exporter = new docx.LocalPacker(doc);
+exporter.pack('My Document');
+
+console.log('Document created successfully at project root!');