Preparing for refactor...

main.py

@@ -1,4 +1,27 @@
 #!/usr/bin/env python3
+"""
+Main Copycat program.
+
+To run it, type at the terminal:
+
+    > python main.py abc abd ppqqrr --interations 10
+
+The script takes three to five arguments. The first two are a pair of strings
+with some change, for example "abc" and "abd". The third is a string which the
+script should try to change analogously. The fourth (which defaults to "1") is
+a number of iterations. One can also specify a defined seed falue for the
+random number generator.
+
+The above might produce output such as
+
+    ppqqss: 6 (avg time 869.0, avg temp 23.4)
+    ppqqrs: 4 (avg time 439.0, avg temp 37.3)
+
+The first number indicates how many times Copycat chose that string as its
+answer; higher means "more obvious". The last number indicates the average
+final temperature of the workspace; lower means "more elegant".
+"""
+
 import argparse
 import logging