Dynamic readme

SetUp.md

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+# Set Up Guide
+
+## Spotify
+
+* Create a [Spotify Application](https://developer.spotify.com/dashboard/applications)
+* Put aside:
+    * `Client ID`
+    * `Client Secret`
+* Click on **Edit Settings**
+* In **Redirect URIs**:
+    * Add `http://localhost/callback/`
+
+## Refresh Token
+
+* Navigate to the following URL:
+
+```
+https://accounts.spotify.com/authorize?client_id={SPOTIFY_CLIENT_ID}&response_type=code&scope=user-read-currently-playing,user-read-recently-played&redirect_uri=http://localhost/callback/
+```
+
+* After logging in, save the {CODE} portion of: `http://localhost/callback/?code={CODE}`
+
+* Create a string combining `{SPOTIFY_CLIENT_ID}:{SPOTIFY_CLIENT_SECRET}` (e.g. `5n7o4v5a3t7o5r2e3m1:5a8n7d3r4e2w5n8o2v3a7c5`) and encode into [Base64](https://www.base64encode.org/).
+
+* Then run a [curl command](https://httpie.org/run) in the form of:
+```sh
+curl -X POST -H "Content-Type: application/x-www-form-urlencoded" -H "Authorization: Basic {BASE64}" -d "grant_type=authorization_code&redirect_uri=http://localhost/callback/&code={CODE}" https://accounts.spotify.com/api/token
+```
+
+* Save the Refresh token
+
+## Vercel
+
+* Register on [Vercel](https://vercel.com/)
+
+* Create project linked to your github repo
+
+* Add System Variables:
+    * `https://vercel.com/<YourName>/<ProjectName>/settings/environment-variables`
+        * `SPOTIFY_REFRESH_TOKEN`
+        * `SPOTIFY_CLIENT_ID`
+        * `SPOTIFY_SECRET_ID`
+
+* Deploy!