Add tests and margain

src/file/table/table-cell/cell-margain/table-cell-margains.ts

@@ -0,0 +1,21 @@
+// http://officeopenxml.com/WPtableCellProperties-Margins.php
+import { XmlComponent } from "file/xml-components";
+
+import { BottomCellMargain, LeftCellMargain, RightCellMargain, TopCellMargain } from "./cell-margain";
+
+export interface ITableCellMargainOptions {
+    readonly top?: number;
+    readonly left?: number;
+    readonly bottom?: number;
+    readonly right?: number;
+}
+
+export class TableCellMargain extends XmlComponent {
+    constructor({ top = 0, left = 0, right = 0, bottom = 0 }: ITableCellMargainOptions) {
+        super("w:tcMar");
+        this.root.push(new TopCellMargain(top));
+        this.root.push(new BottomCellMargain(bottom));
+        this.root.push(new RightCellMargain(right));
+        this.root.push(new LeftCellMargain(left));
+    }
+}