Add README.md file

Author: chifflier

README.md

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+# ansible-lxc-ssh
+Ansible connection plugin using ssh + lxc-attach
+
+## Description
+
+This plugin allows to use Ansible on a remote server hosting LXC containers,
+without having to install SSH servers in each LXC container.
+
+The plugin connects to the host using SSH, then uses `lxc-attach` to enter the
+container. This means the SSH connection must login as `root`, otherwise
+`lxc-attach` will fail.
+
+## Configuration
+
+Add to `ansible.cfg`:
+```
+[defaults]
+connection_plugins = /path/to/connection_plugins/lxc_ssh
+```
+
+Then, modify your `hosts` file to use the `lxc_ssh` transport:
+```
+container ansible_host=server ansible_connection=lxc_ssh ansible_ssh_extra_args=container
+```
+
+## notes
+
+*     I haven't found any proper method to access the 'inventory_name' from the connection plugin, so I used 'ansible_ssh_extra_args' to store the name of the container.
+