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The details about installation can be found in the INSTALL file.
Once you have Greyhole installed (manually, or using a package), you'll want to configure Samba and your storage pool. The details about that are found in the USAGE file. (Use this version of the USAGE file if you are installing 0.9.16 or lower.)
There is also a copy of this file in /usr/share/greyhole/USAGE, if you installed using a package.