Create section properties section

src/file/document/body/section-properties/page-size/page-size-attributes.ts

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+import { XmlAttributeComponent } from "file/xml-components";
+
+export interface IPageSizeAttributes {
+    width: number;
+    height: number;
+}
+
+export class PageSizeAttributes extends XmlAttributeComponent<IPageSizeAttributes> {
+    protected xmlKeys = {
+        width: "w:w",
+        height: "w:h",
+    };
+}

src/file/document/body/section-properties/page-size/page-size.ts

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+import { XmlComponent } from "file/xml-components";
+import { PageSizeAttributes } from "./page-size-attributes";
+
+export class PageSize extends XmlComponent {
+    constructor(width: number, height: number) {
+        super("w:pgSz");
+
+        this.root.push(
+            new PageSizeAttributes({
+                width: width,
+                height: height,
+            }),
+        );
+    }
+}