Add lxc-php README file

lxc-php/README.md

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+# lxc-php
+
+Create LXC containers and install all the required PHP packages as a way to use multiple PHP version on Debian.
+
+*note : this role depend on the lxc role.*
+
+## Tasks
+
+Everything is in the `tasks/main.yml` file.
+
+## Available variables
+
+As this role depend on the lxc role, please refer to it for a variable exhaustive list.
+
+Here is the list of available variables for the PHP part:
+
+* `php_conf_short_open_tag` Default: `"Off"`
+* `php_conf_expose_php` Default: `"Off"`
+* `php_conf_display_errors` Default: `"Off"`
+* `php_conf_log_errors` Default: `"On"`
+* `php_conf_html_errors` Default: `"Off"`
+* `php_conf_allow_url_fopen` Default: `"Off"`
+* `php_conf_disable_functions` Default: `"exec,shell-exec,system,passthru,putenv,popen"`