Added readme file for fxotune

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+Q. I have echo problems on my FXO modules and I've tried the different
+echo cancellation algorithms in zconfig.h, tried tweaking the gains, and
+still nothing works.  What can I do?
+
+A. Use the fxotune utility.
+
+To use:
+Just run the fxotune utility with the -i option.  (`fxotune -i`)  It should
+discover which zap channels are FXO modules and tune them accordingly.  Be warned
+however, it takes a significant amount of time for EACH module to test, I would
+say somewhere around 2-3 minutes.  But you only have to initialize it once for
+the line.  It will write a configuration file to /etc/fxotune.conf.  You will
+need to have your system run fxotune with the -s flag (`fxotune -s`) to set the
+module with the previously discovered values from fxotune.conf for it to take
+affect, so essentially if each time you reboot the machine you need to run 
+`fxotune -s`.  You might consider putting it in your startup scripts some time 
+after the module loads and before asterisk runs.
+
+As always, if you have any questions, you can email me at creslin@NOSPAMdigium.com
+
+Matthew Fredrickson