Add a README file.

Fixes #4085

README.md

@@ -0,0 +1,26 @@
+Clementine
+==========
+
+Clementine is a modern music player and library organizer for Windows, Linux and Mac OS X.
+
+- Website: http://www.clementine-player.org/
+- Github: https://github.com/clementine-player/Clementine
+- Buildbot: http://buildbot.clementine-player.org/grid
+- Latest developer builds: http://builds.clementine-player.org/
+
+Compiling from source
+---------------------
+
+Get the code (if you haven't already):
+
+    git clone https://github.com/clementine-player/Clementine.git && cd Clementine
+
+Compile and install:
+
+    cd bin
+    cmake ..
+    make -j8
+    sudo make install
+
+See the Wiki for more instructions and a list of dependencies:
+https://github.com/clementine-player/Clementine/wiki/Compiling-from-Source