Added useradd default file and usher to manage it

SNAP/useradd.default

@@ -0,0 +1,22 @@
+# Default configuration for the useradd utility
+
+# The default user shell
+SHELL=/bin/bash
+
+# The default GID If the -n option is used
+#GROUP=100
+
+# Default user home directory
+#HOME=/home
+
+# Number of days until account deactivation for expired password
+#INACTIVE=-1
+
+# The date on which the user account is disabled
+#EXPIRE=
+
+# Skeleton directory used to populate a new user's home directory
+#SKEL=/etc/skel
+
+# Create mail spool file during new account creation
+#CREATE_MAIL_SPOOL=yes