add task solution

README.md

@@ -15,4 +15,4 @@ So the third button should count like this:
 - Install Prettier Extesion and use this [VSCode settings](https://mate-academy.github.io/fe-program/tools/vscode/settings.json) to enable format on save.
 - Implement a solution following the [React task guideline](https://github.com/mate-academy/react_task-guideline#react-tasks-guideline).
 - Open one more terminal and run tests with `npm test` to ensure your solution is correct.
-- Replace `<your_account>` with your Github username in the [DEMO LINK](https://<your_account>.github.io/react_counter-js/) and add it to PR description.
+- Replace `<your_account>` with your Github username in the [DEMO LINK](https://kovaltar.github.io/react_counter-js/) and add it to PR description.

src/App.jsx

@@ -2,17 +2,16 @@ import { useState } from 'react';
 import './App.scss';
 
 export const App = () => {
-  const [count] = useState(0);
+  const [count, setCount] = useState(0);
 
   const addOne = () => {
-    // write code here
+    setCount(currentCount => currentCount + 1);
   };
 
   const add100 = () => {
-    // write code here
+    setCount(currentCount => currentCount + 100);
   };
 
-  // DON'T change the code below
   const increase = () => {
     if (count % 5 === 0) {
       add100();