added a file to document linux configuration topics

linux.md

@@ -2,5 +2,7 @@
 
 This document collects knowledge, tips and tricks on all things Linux, that don't get their own document.
 
+- [Setup and Configuration](linux/setup.md)
 - [Linux commands](linux/commands.md)
+- [Permissions](linux/permissions.md)
 - [Terminal](linux/terminal.md)

linux/setup.md

@@ -0,0 +1,20 @@
+# Setup and Configuration
+
+
+## Locales and Keyboard Layouts
+
+Use `localectl` to display and configure locales and keyboard layout:
+
+```sh
+# show current locales
+localectl status
+```
+
+
+### configure layout 'US intl. with deadkeys'
+To configure `US intl. with deadkeys`, set the following values:
+```sh
+ X11 Layout: us
+  X11 Model: default
+X11 Variant: intl
+```