Create quick-install

doc/quick-install

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+# Quick install for Jitsi Meet on GNU/Linux systems
+
+This documents decribes the needed steps for quick Jitsi Meet installation on a Debian based GNU/Linux system.
+
+# Add the repository
+
+```sh
+add-apt-repository 'http://download.jitsi.org/nightly/deb unstable/'
+```
+
+add-apt-repository is in the default Ubuntu install and is available for both Ubuntu and Debian, but if it's not present, either install it with
+
+```sh
+apt-get -y install software-properties-common
+```
+
+or add the repository by hand with
+
+```sh
+echo 'deb http://download.jitsi.org/nightly/deb trusty unstable/' >> /etc/apt/sources.list
+```
+
+# Update the package lists
+
+```sh
+apt-get update
+```
+
+# Install Jitsi Meet
+
+```sh
+apt-get -y install jitsi-meet
+```
+
+During the installation you'll be asked to enter the hostname of the Jitsi Meet instance. If you have a FQDN hostname for the instance already set ip in DNS, enter it there. If you don't have a resolvable hostname, you can enter the IP address of the machine (if it is static or doesn't change).
+
+This hostname (ot IP address) will be used for virtualhost configuration inside the Jitsi Meet and also you and your correspondents will be using it to access the web conferences.
+
+# Open a conference
+
+Launch a web broswer (Chrome, Chromium or latest Opera) and enter in the URL bar the hostname (or IP address) you used in the previous step.
+
+Confirm that you trust the self-signed certificate of the newly installed Jitsi Meet.
+
+Enjoy!