Allows user to specify style id for Tables

Allows user to specify the style Id which will be added in the form of:
<w:tblStyle w:val="TableGrid"/>

As specified in table Structure in http://officeopenxml.com/WPtable.php

src/file/table/table-properties/table-properties.ts

@@ -6,6 +6,7 @@ import { TableBorders } from "./table-borders";
 import { TableCellMargin } from "./table-cell-margin";
 import { ITableFloatOptions, TableFloatProperties } from "./table-float-properties";
 import { TableLayout, TableLayoutType } from "./table-layout";
+import { TableStyle } from "./table-style";
 import { PreferredTableWidth } from "./table-width";
 
 export class TableProperties extends IgnoreIfEmptyXmlComponent {
@@ -46,4 +47,9 @@ export class TableProperties extends IgnoreIfEmptyXmlComponent {
 
         return this;
     }
+
+    public setStyle(styleId: string): TableProperties {
+        this.root.push(new TableStyle(styleId));
+        return this;
+    }
 }

src/file/table/table-properties/table-style.ts

@@ -0,0 +1,15 @@
+import { Attributes, XmlComponent } from "file/xml-components";
+
+export class TableStyle extends XmlComponent {
+    public readonly styleId: string;
+
+    constructor(styleId: string) {
+        super("w:tblStyle");
+        this.styleId = styleId;
+        this.root.push(
+            new Attributes({
+                val: styleId,
+            }),
+        );
+    }
+}

src/file/table/table.ts

@@ -32,6 +32,7 @@ export interface ITableOptions {
     };
     readonly float?: ITableFloatOptions;
     readonly layout?: TableLayoutType;
+    readonly style?: string;
 }
 
 export class Table extends XmlComponent {
@@ -44,6 +45,7 @@ export class Table extends XmlComponent {
         margins: { marginUnitType, top, bottom, right, left } = { marginUnitType: WidthType.AUTO, top: 0, bottom: 0, right: 0, left: 0 },
         float,
         layout,
+        style,
     }: ITableOptions) {
         super("w:tbl");
         this.properties = new TableProperties();
@@ -96,5 +98,9 @@ export class Table extends XmlComponent {
         if (layout) {
             this.properties.setLayout(layout);
         }
+
+        if (style) {
+            this.properties.setStyle(style);
+        }
     }
 }