Add docstring to top of main timesearch.py launch file.

timesearch.py

@@ -1,10 +1,17 @@
+'''
+This is the main launch file for Timesearch.
+
+When you run `python timesearch.py get_submissions -r subredditname` or any
+other command, your arguments will first go to timesearch_modules\__init__.py,
+then into timesearch_modules\get_submissions.py as appropriate for your command.
+'''
+
 import logging
 handler = logging.StreamHandler()
 log_format = '{levelname}:timesearch.{module}.{funcName}: {message}'
 handler.setFormatter(logging.Formatter(log_format, style='{'))
 logging.getLogger().addHandler(handler)
 
-
 import sys
 import timesearch_modules