Added redux-toolkit to project

package-lock.json

package.json

src/App.js

src/Pages/Home/Home.js

src/Pages/Subreddit.js

src/Pages/Subreddit/Subreddit.js

src/Pages/Subreddit/subredditSlice.js

src/Pages/Trends/Trends.js

src/Pages/User/User.js

src/index.js

src/store.js