add ability to vertically align content of section

src/file/document/body/section-properties/vertical-align/vertical-align.ts

@@ -0,0 +1,18 @@
+// http://officeopenxml.com/WPsection.php
+
+import { XmlComponent } from "file/xml-components";
+import { SectionVerticalAlignAttributes } from "./vertical-align-attributes";
+
+export enum SectionVerticalAlignValue {
+    Both = "both",
+    Bottom = "bottom",
+    Center = "center",
+    Top = "top",
+}
+
+export class SectionVerticalAlign extends XmlComponent {
+    constructor(value: SectionVerticalAlignValue) {
+        super("w:vAlign");
+        this.root.push(new SectionVerticalAlignAttributes({ valign: value }));
+    }
+}