Added docstring to clear.py

cupid/clear.py

@@ -1,6 +1,5 @@
 #!/usr/bin/env python
 import os
-import sys
 import click
 import cupid.util
 import shutil
@@ -19,13 +18,18 @@ def readConfigFile(config_path):
         return fullPath
 
     else: #run_dir is empty/wasn't found in config file so return error
-        print("ERROR: 'run_dir' was empty/not found in the config file.")
-        sys.exit(1)
+        raise ValueError("'run_dir' was empty/not found in the config file.")
 
 @click.command()
 @click.argument('config_path')
 #Entry point to this script
 def clear(config_path):
+    """Clears the contents of the 'computed_notebooks' folder at the location specified by the 'run_dir' variable in the 'config.yml' file.
+    
+    Args: config_path - The path to the config.yml file.
+
+    """
+
     run_dir = readConfigFile(config_path)
     #Delete the 'computed_notebooks' folder and all the contents inside of it
     shutil.rmtree(run_dir)