Add 404 page

src/components/404/index.jsx

@@ -0,0 +1,17 @@
+import { Typography } from "@material-ui/core";
+import React from "react";
+import useStyles from '../Styles';
+
+const PageNotFound = () => {
+  const classes = useStyles();
+
+  return (
+    <div className={classes.paper}>
+      <Typography component="h1" variant="h2">
+        Page Not Found
+      </Typography>
+    </div>
+  );
+}
+
+export default PageNotFound;