add line numbers to section

src/file/document/body/section-properties/line-number/index.ts

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+export * from "./line-number";

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

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+// http://officeopenxml.com/WPsectionLineNumbering.php
+import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
+
+export enum LineNumberRestartFormat {
+    CONTINUOUS = "continuous",
+    NEW_SECTION = "newSection",
+    NEW_PAGE = "newPage",
+}
+
+export interface ILineNumberAttributes {
+    readonly lineNumberCountBy?: number;
+    readonly lineNumberStart?: number;
+    readonly lineNumberRestart?: LineNumberRestartFormat;
+    readonly lineNumberDistance?: number;
+}
+
+export class LineNumberAttributes extends XmlAttributeComponent<ILineNumberAttributes> {
+    protected readonly xmlKeys = {
+        lineNumberCountBy: "w:countBy",
+        lineNumberStart: "w:start",
+        lineNumberRestart: "w:restart",
+        lineNumberDistance: "w:distance",
+    };
+}
+
+export class LineNumberType extends XmlComponent {
+    constructor(countBy?: number, start?: number, restart?: LineNumberRestartFormat, dist?: number) {
+        super("w:lnNumType");
+        this.root.push(
+            new LineNumberAttributes({
+                lineNumberCountBy: countBy,
+                lineNumberStart: start,
+                lineNumberRestart: restart,
+                lineNumberDistance: dist,
+            }),
+        );
+    }
+}