Compile SD library

Dependencies:   SDFileSystem USBDevice max32630fthr

Fork of MAX30001-MAX32630FTHR-ECG-EVKIT by Maxim Integrated

Revision:
8:011308330b4e
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Jul 09 17:35:59 2018 +0300
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#78474a5129e18e136cc7e872adbaa5b74fbb8f6a
\ No newline at end of file