add readme

README.md

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+# markov-bot
+
+Markov chain discord bot, sends randomly generated sentences once an hour and when mentioned.
+
+## Setup
+
+Put some text into `corpus.txt`, and then run
+
+    git clone https://git.xeno.science/xenofem/markov-bot
+    cd markov-bot
+    python3 -m venv env
+    source env/bin/activate
+    pip install discord.py
+    python markov-prep.py
+    echo <token> > token
+    python markov-bot.py