test/*: add convinient files for running simulation

After running hdlmake --make-isim, all that is necessary to do is
running run.sh script

test/isim_cmd

+run 1000 ns

test/run.sh

+#!/bin/bash
+
+# Tests for empty parameter
+if [ -z $1 ] ; then
+	echo "You must specify a top module testbench!";
+	echo "Usage: $0 <TOP_MODULE_WITHOUT_EXTENSION>";
+	exit 1;
+fi
+
+make && make fuse TOP_MODULE=$1 && ./isim_proj -view wave.wcfg -tclbatch isim_cmd -gui