add basic TahoeFS pointers to the documentation

docs/contrib.rst

@@ -10,6 +10,11 @@ DAV (WebDAV Protocol)
 An interface to WebDAV file servers. See :mod:`fs.contrib.davfs`
 
 
+Tahoe LAFS
+----------
+An interface to Tahoe Least-Authority File System.  See :mod:`fs.contrib.tahoefs`
+
+
 BIG (BIG Archive File Format)
 -----------------------------
 A read-only interface to the BIG archive file format used in some EA games titles (e.g. Command & Conquery 4).  See :mod:`fs.contrib.bigfs`

docs/contrib/index.rst

@@ -7,5 +7,6 @@ The ``fs.contrib`` module contains a number of filesystem implementations provid
    :maxdepth: 3
    
    davfs.rst
+   tahoefs.rst
    bigfs.rst
 

docs/contrib/tahoefs.rst

+.. automodule:: fs.contrib.tahoefs
+    :members: