Adding simulation files to blink example

Examples/blink/logic/simulation/blink_TB.do

@@ -0,0 +1,12 @@
+vlib work
+vlog  +acc  "../blink.v"
+vlog  +acc  "../blink_TB.v"
+vlog  +acc  "/opt/cad/Xilinx/verilog/src/glbl.v"
+vsim -t 1ps   -L xilinxcorelib_ver -L unisims_ver  blink_TB_v glbl
+view wave
+do wave.do
+#add wave *
+add wave /glbl/GSR
+view structure
+view signals
+run 15ms