add ability to vertically align content of section

demo/48-vertical-align.ts

@@ -0,0 +1,31 @@
+// Example of making content of section vertically aligned
+// Import from 'docx' rather than '../build' if you install from npm
+import * as fs from "fs";
+import { Document, Packer, Paragraph, SectionVerticalAlignValue, TextRun } from "../build";
+
+const doc = new Document();
+
+doc.addSection({
+    properties: {
+        valign: SectionVerticalAlignValue.Center,
+    },
+    children: [
+        new Paragraph({
+            children: [
+                new TextRun("Hello World"),
+                new TextRun({
+                    text: "Foo Bar",
+                    bold: true,
+                }),
+                new TextRun({
+                    text: "Github is the best",
+                    bold: true,
+                }).tab(),
+            ],
+        }),
+    ],
+});
+
+Packer.toBuffer(doc).then((buffer) => {
+    fs.writeFileSync("My Document.docx", buffer);
+});