add support for floating drawings

- added need elements and test for them

src/file/drawing/floating/align.spec.ts

@@ -0,0 +1,15 @@
+import { assert } from "chai";
+
+import { Align } from "./align";
+import { Utility } from "../../../tests/utility";
+import { VerticalPositionAlign } from ".";
+
+describe("Align", () => {
+    describe("#constructor()", () => {
+        it("should create a element with correct root key", () => {
+            const newJson = Utility.jsonify(new Align(VerticalPositionAlign.CENTER));
+            assert.equal(newJson.rootKey, "wp:align");
+            assert.include(newJson.root[0], VerticalPositionAlign.CENTER);
+        });
+    });
+});