move indent.ts over to paragraph and add a #indent method

ts/docx/paragraph/indent.ts

@@ -0,0 +1,27 @@
+import { XmlAttributeComponent, XmlComponent } from "../docx/xml-components";
+
+interface IndentAttributesProperties {
+    left: number;
+    hanging: number;
+}
+
+class IndentAttributes extends XmlAttributeComponent {
+
+    constructor(properties: IndentAttributesProperties) {
+        super({
+            left: "w:left",
+            hanging: "w:hanging",
+        }, properties);
+    }
+}
+
+export class Indent extends XmlComponent {
+
+    constructor(left: number, hanging?: number) {
+        super("w:ind");
+        this.root.push(new IndentAttributes({
+            left: left,
+            hanging: hanging,
+        }));
+    }
+}