Getting started: Add icon and desktop file

Setting up the icon and desktop file is a pretty central part
of making an application work, so we should do it for our example.

The fact that the examples are uninstalled makes this a little
more complicated.

examples/application1/README

@@ -0,0 +1,9 @@
+To make gnome-shell use the desktop file and icon for this example
+while running it uninstalled, do the following:
+
+mkdir -p ~/.local/share/applications
+sed -e "s#@bindir@#$PWD#" exampleapp.desktop \
+  > ~/.local/share/applications/lt-exampleapp.desktop
+
+mkdir -p ~/.local/share/icons/hicolor/48x48/apps
+cp exampleapp.png ~/.local/share/icons/hicolor/48x48/apps

examples/application1/exampleapp.desktop

@@ -0,0 +1,6 @@
+[Desktop Entry]
+Type=Application
+Name=Example
+Icon=exampleapp
+StartupNotify=true
+Exec=@bindir@/exampleapp