init: Init React Application

src/app/index.tsx

@@ -0,0 +1,17 @@
+import * as React from "react";
+
+import { BrowserRouter } from "react-router-dom";
+
+import { Router } from "./router";
+import { theme } from "@shared";
+import { ThemeProvider } from "@mui/material/styles";
+import { ToastContainer } from "react-toastify";
+
+export const App: React.FC = () => (
+  <ThemeProvider theme={theme}>
+    <ToastContainer />
+    <BrowserRouter>
+      <Router />
+    </BrowserRouter>
+  </ThemeProvider>
+);