Add manual page

Author: thkukuk

README.md

@@ -42,10 +42,10 @@ image is used, the `REGISTRY` and/or `IMAGE` needs to be specified with every
 
 Beside the user configuration file, there are two additional system wide
 configuration files:
-* `/usr/etc/toolboxrc`: distribution specific configuration file
+* `/usr/share/toolbox/toolboxrc`: distribution specific configuration file
 * `/etc/toolboxrc`: system specific configuration file created by a system administrator
 
-The configuration files are read in the order: `/usr/etc/toolboxrc`,
+The configuration files are read in the order: `/usr/share/toolbox/toolboxrc`,
 `/etc/toolboxrc`, `~/.toolboxrc`. The last value is used.
 
 ### Alternative UI

toolbox

@@ -32,7 +32,7 @@ else
     echo "$0: ERROR: neither 'podman' nor 'docker' are available. Exiting!"
 fi
 
-test -f /usr/etc/toolboxrc && . /usr/etc/toolboxrc
+test -f /usr/share/toolbox/toolboxrc && . /usr/share/toolbox/toolboxrc
 test -f /etc/toolboxrc && . /etc/toolboxrc
 
 MODE="system"