update auth.py to use a auth.json file instead, with functional default file

auth.py

@@ -0,0 +1,32 @@
+import logging, sys, os, json
+
+# Open the file and get keys
+PATH = os.path.join(sys.path[0], 'auth.json')
+
+# Ensure the file exists, if not, generate one and error with a reason
+if not os.path.exists(PATH):
+    with open(PATH, 'w') as file:
+        # Dump a pretty-printed dictionary with default values
+        json.dump(
+            {
+                'USERNAME' : 'Your Username Here',
+                'CLIENT_ID' : 'Your Client ID Here',
+                'CLIENT_SECRET' : 'Your Client Secret Here',
+                'REDIRECT_URI' : 'Your Redirect URI Callback Here', 
+                'SCOPE' : ['Your Scopes Here']
+            },
+            file,
+            indent=3
+        )
+        # Error critically, then exit
+        logging.critical("No \'auth.json\' file detected, one has been created for you")
+        logging.critical("Please fill out with your Spotify credentials, and then restart the program")
+        sys.exit()
+FILE = json.load(open(PATH, 'r'))
+
+# Load all configuration variables
+USERNAME = FILE['USERNAME']
+CLIENT_ID = FILE['CLIENT_ID']
+CLIENT_SECRET = FILE['CLIENT_SECRET']
+REDIRECT_URI = FILE['REDIRECT_URI']
+SCOPE = ' '.join(FILE['SCOPE'])