add comment on decodePassword

metroidgen.py

     def decodePassword(self, pwd):
         """ Sanity checking! This function decodes an input password back into a bitfield,
             so that you can check that it was properly encoded.
+            Q: Why doesn't this display the game state?
+            A: I trust that https://www.truepeacein.space properly encodes the game state.
+               So when I create a game state with the randomizer, I can recreate that
+               game state at TPIS and use the password generates as its input, to check
+               against my randomized game password. In other words, this is a testing 
+               function, and in the intended use case I'll know what the input bitfield is 
+               and be able to check against it.
         """
         densePwd = pwd.replace(" ","")
         numPwd = []