Added a readme for instructions on how to use/install the profile extensions

diff --git a/plugins/GNUsocialProfileExtensions/README.txt b/plugins/GNUsocialProfileExtensions/README.txt
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+++ b/plugins/GNUsocialProfileExtensions/README.txt
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+GNU Social Profile Extensions
+=============================
+
+Allows administrators to define additional profile fields for the
+users of a GNU Social installation.
+
+
+Installation
+------------
+
+To install, copy this directory into your plugins directory and add
+the following lines to your config.php file:
+
+addPlugin('GNUsocialProfileExtensions');
+$config['admin']['panels'][] = 'profilefields';
+