Change docx folder to more appropriate "file" folder

src/file/paragraph/run/picture-run.ts

@@ -0,0 +1,16 @@
+import { Drawing } from "../../drawing";
+import { IData } from "../../media/data";
+import { Run } from "../run";
+
+export class PictureRun extends Run {
+
+    constructor(imageData: IData) {
+        super();
+
+        if (imageData === undefined) {
+            throw new Error("imageData cannot be undefined");
+        }
+
+        this.root.push(new Drawing(imageData));
+    }
+}