add package script and install howto

INSTALL.md

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+# Installing slide
+
+## Install dependencies
+
+This project depends on the following dynamically linked libraries:
+
+* qt5
+* libexif
+
+### OSX
+
+```
+brew install qt libexif
+```
+
+### Raspbian Stretch
+
+```
+brew install qt5 libexif12
+```
+
+## Extract binaries
+
+```
+tar xf slide_<arch>_<version>.tar.gz
+```
+
+## Move binary to executable folder
+
+### OSX
+
+```
+mv slide_<version>/slide.app/Contents/MacOS/slide /usr/bin/
+```
+
+### Linux
+
+```
+mv slide_<version>/slide /usr/bin/
+```

sbin/package.sh

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+#!/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"