Add build script

README.md

 #### doxverilog ####
-The is a clone of doxverilog repository tested on Elphel projects. It will be kept in sync with the original repository on Bitbucket:
+This is a clone of doxverilog repository tested on Elphel projects. It will be kept in sync with the original repository on Bitbucket:
 [https://bitbucket.org/maddoxx/doxverilog.git](https://bitbucket.org/maddoxx/doxverilog.git)
+
+Start *build.sh* to compile doxverilog.

build.sh

+#!/bin/bash
+
+if [ ! -z $(which cmake) ]; then
+	mkdir build
+	cd build
+	cmake -G "Unix Makefiles" ..
+	make
+else
+	echo "cmake is not found, can not start compilation"
+fi