add task solution

src/App.tsx

@@ -1,7 +1,29 @@
 import React from 'react';
 
-export const App: React.FC = () => (
-  <div className="App">
-    <p className="App__message">The last pressed key is [Enter]</p>
-  </div>
-);
+export class App extends React.Component{
+  state = {
+    lastKey: ''
+  }
+
+  handleKeyDown = (event: KeyboardEvent) => {
+    this.setState({ lastKey: event.key });
+  };
+
+  componentDidMount() {
+    document.addEventListener('keyup', this.handleKeyDown);
+  }
+
+  render() {
+
+    const {lastKey} = this.state
+
+    return (
+      <div className="App">
+        {lastKey ?
+          (<p className="App__message">The last pressed key is [{lastKey}]</p>)
+          :
+          (<p className="App__message">Nothing was pressed yet</p>)}
+      </div>
+    )
+  }
+}