keyboard input, serial com test

Dependencies:   mbed DISCO_L475VG_IOT01A_wifi TextLCD USBHost

Revision:
6:9d975a9d2728
diff -r 0466445897b8 -r 9d975a9d2728 DISCO_L475VG_IOT01A_wifi.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DISCO_L475VG_IOT01A_wifi.lib	Thu Aug 15 19:33:04 2019 +0000
@@ -0,0 +1,1 @@
+https://developer.mbed.org/teams/ST/code/DISCO_L475VG_IOT01A_wifi/#c61a93635433