Fleshed out the README a bit

README.md

@@ -1,2 +1,21 @@
 # Shantybot
 
+## What does it do?
+
+This is a bot that takes lyrics from `corpus.txt`, and generates sentences based on a Markov chain trained on that text.
+
+This repeats until it has generated two stanzas, each with four lines with an ABAB/CDCD rhyming structure and roughly similar numbers of syllables.
+
+It then posts the completed two stanza sea shanty to Mastodon under a content warning.
+
+To make this work on a regular basis, just set a cron job to tell it to post when you want it to.
+
+## Also
+
+Update: Just in case there's a problem, I added a script that allows me to delete bad sea shanties, because *YOU NEVER KNOW* when a bot will say something bad.
+
+## Live version
+
+See https://botsin.space/@shantybot for a live version
+
+I took the sea shanties from http://www.jsward.com/shanty/ to build the corpus