add package script and install howto

INSTALL.md

@@ -0,0 +1,40 @@
+# 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/
+```