Add packaging_apps_arguments_management.md

packaging_apps_arguments_management.md

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+<a class="btn btn-lg btn-default" href="packaging_apps_en">Application packaging</a>
+
+## Arguments management
+#### Retrieve arguments in the install script from manifest
+Arguments are give to the install script from the manifest in it's order. For instance for Roundcube, `domain` and `path` arguments will respectively be retreive from `$1` and `$2` parameters in the install script.
+
+```bash
+# Retrieve arguments
+domain=$1
+path=$2
+```
+
+#### Save arguments for other scripts
+Remove, upgrade, backup and restore scripts could need arguments.
+
+YunoHost could save arguments with this command which is generally used in the install script:
+```bash
+# Store config on YunoHost instance
+sudo yunohost app setting $app domain -v $domain
+```
+
+Then, the script can retrieve saved arguments with this command:
+```bash
+domain=$(sudo yunohost app setting $app domain)
+```
+
+Those data are saved in `/etc/yunohost/apps/<app_name>/settings.yml`.