feature: add support to add mutiple sections to the document inc. headers and footers

- write missing tests

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

@@ -0,0 +1,41 @@
+// http://officeopenxml.com/WPSectionPgNumType.php
+import { XmlComponent, XmlAttributeComponent } from "file/xml-components";
+
+export enum PageNumberFormat {
+    CARDINAL_TEXT = "cardinalText",
+    DECIMAL = "decimal",
+    DECIMAL_ENCLOSED_CIRCLE = "decimalEnclosedCircle",
+    DECIMAL_ENCLOSED_FULL_STOP = "decimalEnclosedFullstop",
+    DECIMAL_ENCLOSED_PAREN = "decimalEnclosedParen",
+    DECIMAL_ZERO = "decimalZero",
+    LOWER_LETTER = "lowerLetter",
+    LOWER_ROMAN = "lowerRoman",
+    NONE = "none",
+    ORDINAL_TEXT = "ordinalText",
+    UPPER_LETTER = "upperLetter",
+    UPPER_ROMAN = "upperRoman",
+}
+
+export interface IPageNumberTypeAttributes {
+    pageNumberStart?: number;
+    pageNumberFormatType?: PageNumberFormat;
+}
+
+export class PageNumberTypeAttributes extends XmlAttributeComponent<IPageNumberTypeAttributes> {
+    protected xmlKeys = {
+        pageNumberStart: "w:start",
+        pageNumberFormatType: "w:fmt",
+    };
+}
+
+export class PageNumberType extends XmlComponent {
+    constructor(start?: number, numberFormat?: PageNumberFormat) {
+        super("w:pgNumType");
+        this.root.push(
+            new PageNumberTypeAttributes({
+                pageNumberStart: start,
+                pageNumberFormatType: numberFormat,
+            }),
+        );
+    }
+}