Add README

README.md

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+# ![Carla Logo](https://raw.githubusercontent.com/falkTX/Carla/master/resources/48x48/carla.png) Carla Plugin Host
+[![Build Status](https://travis-ci.org/falkTX/Carla.png)](https://travis-ci.org/falkTX/Carla)
+
+What is Carla?
+---------------
+
+Carla is a fully-featured audio plugin host, with support for many audio drivers and plugin formats.<br>
+It's open source and licensed under the GNU General Public License, version 2 or later.
+
+This repository contains external plugins not part of the default Carla source code.<br>
+The reason for the split is to keep the main Carla code small, as these plugins are optional.<br>
+
+Note that these plugins are not usable as-is, they require Carla.