add package script and install howto

sbin/package.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+ARCH=$1
+VERSION=$2
+
+set -euo pipefail
+
+if [[ "$ARCH" == "" ]]; then
+    echo "missing argument target_architecture"
+    exit 1
+fi
+if [[ "$VERSION" == "" ]]; then
+    echo "missing argument version"
+    exit 1
+fi
+
+BINARY=slide
+if [[ "$ARCH" == "osx" ]]; then
+    BINARY=slide.app
+fi
+
+cd "$DIR/.."
+mkdir -p make/slide_$VERSION
+cd make
+qmake ../src/slide.pro
+make
+cp -r "$BINARY" "slide_$VERSION/"
+cp "../INSTALL.md" "slide_$VERSION/"
+cp "../LICENSE" "slide_$VERSION/"
+tar cfz slide_${ARCH}_$VERSION.tar.gz "slide_$VERSION"