Add README

README.md

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+## Usage
+
+### Please note that this won't work without Spotify Premium because Spotify limits web API access to non-free accounts.
+
+* Go to [https://developer.spotify.com/dashboard/applications](https://developer.spotify.com/dashboard/applications) and create an application. Call it whatever you want.
+
+* Create a `.env` or `.envrc` file with contents like this, put it wherever you
+  want.
+
+```
+export SPOTIPY_CLIENT_ID='YOUR_CLIENT_ID'
+export SPOTIPY_CLIENT_SECRET='YOUR_CLIENT_SECRET'
+export SPOTIPY_REDIRECT_URI='http://localhost'
+export SPOTIFY_USERNAME='YOUR_SPOTIFY_USERNAME'
+```
+
+* You can find the values for `SPOTIPY_CLIENT_ID` and `SPOTIPY_CLIENT_SECRET`
+  on the page for your application that you just created.
+
+* You can find your spotify username [here](https://www.spotify.com/us/account/overview/)
+
+* Now you can run `spotify-mpd-sync` with your `.env` file sourced (e.g. `source .env`)