✨(components) add react repo

This repo only contains a Button which is here only for demonstration purpose.
Its purpose is to contain all the future react-based components of the
design system.

packages/react/src/components/Button/index.spec.tsx

@@ -0,0 +1,12 @@
+import { describe, expect, it } from "vitest";
+import { render, screen } from "@testing-library/react";
+import React from "react";
+import { Button } from "./index";
+
+describe("<Button/>", () => {
+  it("renders", () => {
+    render(<Button />);
+    const button = screen.getByRole("button", { name: "<Button/>" });
+    expect(button.classList.contains("c__button")).toBe(true);
+  });
+});