Change docx folder to more appropriate "file" folder

src/file/xml-components/default-attributes.ts

@@ -0,0 +1,26 @@
+import { BaseXmlComponent } from "./base";
+import { IXmlableObject } from "./xmlable-object";
+
+export type AttributeMap<T> = {[P in keyof T]: string};
+
+export abstract class XmlAttributeComponent<T> extends BaseXmlComponent {
+    protected root: T;
+    protected xmlKeys: AttributeMap<T>;
+
+    constructor(properties: T) {
+        super("_attr");
+        this.root = properties;
+    }
+
+    public prepForXml(): IXmlableObject {
+        const attrs = {};
+        Object.keys(this.root).forEach((key) => {
+            const value = this.root[key];
+            if (value !== undefined) {
+                const newKey = this.xmlKeys[key];
+                attrs[newKey] = value;
+            }
+        });
+        return {_attr: attrs};
+    }
+}