Improve documentation

doc/localuser.md

@@ -13,6 +13,25 @@ The associated password can be determined using the variable `localuser_password
 
 Default: `Muster!`
 
+## Configuration / Variables
+
+  * **localuser**
+    Username of local guest account
+    If set to `false` no user will be created
+    Type: *String*/*Boolean*
+    Values:
+    * `false` <-- (default)
+    * "username"
+  * **localuser_password**
+    Password of local guest user
+    Default: "Muster!"
+    Type: *String*
+  * **localuser_secretsalt**
+    Salt for creation of password hash
+    Default: "4ANAxPycC3q"
+    Type: *String*
+
+
 ## Example
 
 * Create local guest user only on devices in group laptops.