created simple build script

build.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# Copyright 2021 The Hush Developers
+# Released under GPLv3
+
+# Check if go is installed on system and exits if it is not
+if ! [ -x "$(command -v go)" ]; then
+  echo 'Error: go is not installed. Install go and try again.' >&2
+  exit 1
+fi
+
+# now to compiling...
+cd `pwd`/cmd/server
+go build main.go
+# move compiled main.go to lightwalletd
+mv main `pwd`/../../lightwalletd
+echo "lightwalletd is now compiled for you"