Merge pull request #1544 from TanekLiang/qemu-a9

[bsp][qemu-vexpress-a9] add qemu-nographic.bat for windows

bsp/qemu-vexpress-a9/qemu-nographic.bat

@@ -0,0 +1,6 @@
+@echo off
+if exist sd.bin goto run
+qemu-img create -f raw sd.bin 64M
+
+:run
+qemu-system-arm -M vexpress-a9 -kernel rtthread.elf -nographic -sd sd.bin