[Patch-gnuradio] README file in gr-howto-write-a-block

[Martin Braun]

After finding out I'm not the only one who stumbles over things when
using gr-howto as a module template, I added some lines to the README
file. I guess this could be useful.

MB
-- 
Dipl.-Ing. Martin Braun           Phone: +49-(0)721-608 3790
Institut fuer Nachrichtentechnik  Fax:   +49-(0)721-608 6071
Universitaet Karlsruhe (TH)       http://www.int.uni-karlsruhe.de/

readme.diff
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