add install script

Author: jasonkarns

install.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# Usage: PREFIX=/usr/local ./install.sh
+#
+# Installs node-build under $PREFIX.
+
+set -e
+
+cd "$(dirname "$0")"
+
+if [ -z "${PREFIX}" ]; then
+  PREFIX="/usr/local"
+fi
+
+SHARE_PATH="${PREFIX}/share/node-build"
+
+mkdir -p "$SHARE_PATH"
+
+install -p -m 0644 share/node-build/* "$SHARE_PATH"