creat files in sd

Dependencies:   SDFileSystem mbed

Revision:
0:771b62e3ab62
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDFileSystem.lib	Wed May 06 10:46:46 2015 +0000
@@ -0,0 +1,1 @@
+http://developer.mbed.org/users/mbed_official/code/SDFileSystem/#7b35d1709458