Added README.md

src/App.tsx

@@ -1,5 +1,6 @@
 import Alert from "./Alert";
 import Message from "./Message";
+import Button from "./Button";
 import ListGroup from "./components/ListGroup";
 
 function App() {
@@ -23,6 +24,12 @@ function App() {
                     onSelectItem={handleSelectItem}
                 />
             </div>
+            <div>
+                <Button />
+            </div>
+            <div>
+                <Message />
+            </div>
         </>
     );
 }

src/Button.tsx

@@ -0,0 +1,13 @@
+import React from "react";
+
+const Button = () => {
+    return (
+        <>
+            <button type="button" className="btn btn-primary">
+                Primary
+            </button>
+        </>
+    );
+};
+
+export default Button;