frontrow plugin: fix headers install script, add a README with simple building and installation instructions

projects/macosx/frontrow_plugin/BackRowHeaders/install.sh

@@ -1,3 +1,8 @@
 #!/bin/sh
 
-sudo ln -sf $PWD/`dirname $0`/Headers /System/Library/PrivateFrameworks/BackRow.framework/PrivateHeaders
+if ! test -e $PWD/Headers/BREvent.h; then
+    echo "Please run this script from BackRowHeaders directory"
+    exit 1
+else
+    sudo ln -sf $PWD/Headers /System/Library/PrivateFrameworks/BackRow.framework
+fi

projects/macosx/frontrow_plugin/README

@@ -0,0 +1,15 @@
+Compilation
+ ---------
+
+Run "BackRowHeaders; ./install.sh" to install the Headers needed for the
+FrontRow plugin. BackRow is a private framework of MacOSX, and so the Headers
+are not public.
+
+Then open the project in XCode to build it.
+
+
+
+Installation
+ ----------
+
+Copy VLC.frappliance to /System/Library/CoreServices/Front\ Row.app/Contents/PlugIns . That's all folks !