Close #168 - add linux installation basic tuto for agent

doc/source/armadito-agent/installation/linux.rst

@@ -1,7 +1,32 @@
 Installation on Linux
 =====================
 
-Instructions
-------------
+A PPA is provided for Ubuntu in order to simplify installation.
+For other distributions, installation can always be done by following instructions given in *Build from Sources* previous section of this documentation.
+Later works could include packaging for other distributions. Crontributions on that part could be really useful for the project.
+
+Ubuntu with PPA
+---------------
+
+Currently available for :
+
+* xenial (16.04LTS)
+
+
+To install :
+::
+
+   $ sudo add-apt-repository ppa:armadito/armadito-av
+   $ sudo apt-get update
+   $ sudo apt-get install libarmadito-agent-perl
+
+
+After installation, you can enroll your computer :
+::
+
+   $ sudo armadito-agent -t "Enrollment" -k "AAAAE-AAAAD-AAAAF-AAAAZ-AAAA5"
+
+
+For further informations, see `Launchpad.net <https://launchpad.net/~armadito/+archive/ubuntu/armadito-av>`_
 
 .. toctree::