Add footnotes class

src/file/footnotes/footnote/footnote.ts

@@ -0,0 +1,19 @@
+import { XmlComponent } from "file/xml-components";
+import { Paragraph } from "../../paragraph";
+import { FootnoteAttributes } from "./footnote-attributes";
+
+export class FootNote extends XmlComponent {
+    constructor(id: number, type?: string) {
+        super("w:footnote");
+        this.root.push(
+            new FootnoteAttributes({
+                type: type,
+                id: id,
+            }),
+        );
+    }
+
+    public addParagraph(paragraph: Paragraph): void {
+        this.root.push(paragraph);
+    }
+}