Using a better demo naming system

demo/8-header-footer.ts

@@ -0,0 +1,26 @@
+// Add text to header and footer
+// Import from 'docx' rather than '../build' if you install from npm
+import * as fs from "fs";
+import { Document, Footer, Header, Packer, Paragraph } from "../build";
+
+const doc = new Document();
+
+doc.addSection({
+    headers: {
+        default: new Header({
+            children: [new Paragraph("Header text")],
+        }),
+    },
+    footers: {
+        default: new Footer({
+            children: [new Paragraph("Footer text")],
+        }),
+    },
+    children: [new Paragraph("Hello World")],
+});
+
+const packer = new Packer();
+
+packer.toBuffer(doc).then((buffer) => {
+    fs.writeFileSync("My Document.docx", buffer);
+});