Add README

README.md

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 # spotify-rewind
+This React and Express app uses the Spotify Web API to display a Spotify user's top tracks, playlists, and artists.
+
+Check it out at [https://spotifyrewind.dev/](https://spotifyrewind.dev/)! 🎉🎉🎉
+
+![OG image preview](./client/public/og.png)
+
+
+## Local Development
+- add your Spotify Developer keys to `./client/.env` and `./server/.env`
+### With Docker
+```Bash
+docker build -t kaiweimo/spotify-rewind-frontend ./client
+docker run -d -p 3000:3000 kaiweimo/spotify-rewind-frontend
+
+docker build -t kaiweimo/spotify-rewind-backend ./server
+docker run -d -p 8888:8888 kaiweimo/spotify-rewind-backend
+```
+
+### With Node
+```Bash
+cd client
+npm install
+npm start
+```
+```Bash
+cd server
+npm install
+npm start
+```