hash and save auth credentials

diff --git a/README b/README
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--- /dev/null
+++ b/README
@@ -0,0 +1,10 @@
+Setup
+=====
+
+1.     You'll need to save your auth credentials to ~/.libre.fm-cmus.auth:
+
+               unset HISTFILE
+               coffee -e "require('./auth.coffee').save_auth 'USERNAME','PASSWORD'"
+
+       (Substituting your libre.fm username and password of course.) The first
+       line disables history saving in bash, and perhaps other shells.

diff --git a/auth.coffee b/auth.coffee
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--- /dev/null
+++ b/auth.coffee
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+fs = require 'fs'
+crypto = require 'crypto'
+
+md5 = (str) ->
+       sum = crypto.createHash 'md5'
+       sum.update str
+       return sum.digest 'hex'
+
+new_auth_token = (user, pass) -> md5(user + md5(pass))
+
+save_auth = (user, pass, callback) ->
+       token = new_auth_token(user, pass)
+       text = JSON.stringify user: user, token: new_auth_token(user, pass)
+       fs.writeFile "#{process.env.HOME}/.libre.fm-cmus.auth", text, 'utf8', callback
+       return token
+
+exports.new_auth_token = new_auth_token
+exports.save_auth = save_auth