* added small README to plethora (aka Plethora Core)

README

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+Plethora Core
+=============
+
+Plethora Core is a mnemosyne-based Desktop distribution, for the
+undecided user, including different Desktop Enviroments, also
+different mail clients, and different Office Suites.
+
+About the name
+--------------
+
+In medicine, plethora refers to a general increase in the volume of
+blood. In other contexts it means an overabundance or surfeit.
+
+The 'Core' ending, is just because it sounds similar to a well known
+generic and bloated distribution, Fedora Core.
+