readme: add zachster

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+These utilities help to solve gurgle puzzles.
+
+
+STRATEGY
+
+1. Figure out what letters you need
+2. Guess the word
+
+
+WHAT YOU NEED
+
+two files:
+* solutions.txt
+* guessable.txt
+(a basic 5-letter-word list will suffice for both)
+
+posix-compatible programs:
+* sh
+* grep
+* wc
+* cat
+* tr
+* test
+* echo
+* sort
+* uniq
+* awk
+
+
+UTILITIES
+
+* has.sh: filter program for the correct letter in an incorrect position. Called by gurg.sh
+* gurg.sh: creates multiple filters for a guess in Guess Syntax
+* whatToDo.sh: Gives advice on whether to guess the word, or guess unguessed letters. Has optional threshold parameter.
+
+
+GUESS SYNTAX
+
+guess G.esS
+
+you guessed the word `guess`, and
+* the G was in the correct position
+* the U was not present
+* the E was in the incorrect position
+* the fourth s was in the incorrect position
+* the fifth S was in the correct position.
+
+
+EXAMPLE
+
+```sh
+cat solutions.txt | ./whatToDo.sh guessable.txt
+# Outputs the Letter Frequency,
+# and words that contain the Most Frequent letters.
+cat solutions.txt | ./gurg.sh guess ..e.S | ./whatToDo.sh guessable.txt
+# Outputs LF and words that contain MF *unguessed* letters.
+cat solutions.txt |./gurg.sh guess ..e.S | ./gurg.sh ratio .at.. |./whatToDo.sh guessable.txt
+# Outputs a list of Possible Solutions
+cat solutions.txt |./gurg.sh guess ..e.S | ./gurg.sh ratio .at.. |./whatToDo.sh guessable.txt 5
+# Outputs LF
+```
+
+
+CAVEATS
+
+Currently only supports 5-letter puzzles using ascii characters. Patches welcome.