Add install instructions.

[simolev]

Please add some simple install instructions so beginners are not put off because they don't know what to do. On Ubuntu I had to:

• Download the .deb file corresponding to the Ubuntu version (Artful, Bionic, Cosmic, ...) from the releases page.
• run sudo dpkg -i <file.deb> to install musikcube.
• run sudo apt-get -f install to install all needed dependencies.
• run /usr/bin/musikcubed to start the server daemon.
• run /usr/bin/musikcube to start the program interactively.
• select the directory containing the music files and press <spacebar>.

To create a service:
sudo touch /etc/systemd/system/musikcube.service
sudo systemctl edit --full musikcube.service

Service definition (replace <user> with your username):

[Install]
WantedBy=network-online.target

[Unit]
Description=MusikCube Audio Streaming Server
Before=multi-user.target
Before=graphical.target
Before=shutdown.target
After=local-fs.target
After=remote-fs.target
After=network-online.target
After=nss-lookup.target
Wants=network-online.target
Conflicts=shutdown.target

[Service]
Type=forking
User=<user>
ExecStart=/usr/bin/musikcubed --start
ExecStop=/usr/bin/musikcubed --stop

Auto start the service on system startup:
systemctl enable musikcube

[clangen]

This is great! Thank you for taking the time to show ho to make a systemd service definition. I'll make sure to add these instructions before the next release, which will probably drop within the next couple weeks!

[clangen]

First crack at the installation guide: https://github.com/clangen/musikcube/wiki/installing