Added spotify api notes

Spotify.md

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+
+# How the Spotify API registration works
+
+[Spotify Docs](https://developer.spotify.com/documentation/web-api/tutorials/getting-started#create-an-app)
+
+## Creating an App with their developer console
+
+https://developer.spotify.com/dashboard
+
+*App* name: Serena
+*App description*: open source radio station emulator to get the vibe right
+*redirect URI*: https://localhost:3000
+
+## Requesting an Access Token
+
+```Bash
+curl -X POST "https://accounts.spotify.com/api/token" \
+     -H "Content-Type: application/x-www-form-urlencoded" \
+     -d "grant_type=client_credentials&client_id=your-client-id&client_secret=your-client-secret"
+```
+
+Our Codes: 
+Client: 
+e1274b6593674771bea12d8366c7978b
+Client Secret: 
+07a3440d8d4b4fbe9d736a48df079085
+
+Resulting access token is valid for **One Hour**
+
+Access Token: 
+BQAtYzlcWAvIdAEIE38FOnzWbUuXWm-XRYXB7DBe1xYUSqonVGDi4_H-9pWKbhexZ-ePP8uQSe-9VNaz05gCJq549tI3EFT3UoFvcUcBvwtQGK3i0dBh2sQi7bohCgDBIGcnzADcd-Y