Add module docstring

.bin/pomo

@@ -1,11 +1,11 @@
-#!/usr/bin/env python
+# /usr/bin/env python3
+"""
+Pomodoro timer
 
-# Pomodoro timer
+- Writes pomodoro timer to temporary file so statusbar can read it
-#
+- Notification on session finish
-# - Writes pomodoro timer to temporary file so dwmblocks
+- Notification on break finish
-#   statusbar can read it
+"""
-# - Notification on session finish
-# - Notification on break finish
 
 import os
 import atexit