added useradd command to _commands/ubuntu/

_commands/ubuntu/useradd.md

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+---
+---
+
+useradd
+---
+In Linux, a ‘useradd‘ command is a low-level utility that is used for adding/creating user accounts in Linux and other Unix-like operating systems. The ‘adduser‘ is much similar to useradd command, because it is just a symbolic link to it
+
+
+~~~ bash
+$ useradd [options] username
+~~~
+
+<!--more-->
+
+### `How it works`
+When we run ‘useradd‘ command in Linux terminal, it performs following major things:
+
+1.It edits /etc/passwd, /etc/shadow, /etc/group and /etc/gshadow files for the newly created User account.<br>
+2.Creates and populate a home directory for the new user.<br>
+3.Sets permissions and ownerships to home directory.<br>
+
+### `Add a new user`
+To add/create a new user, all you’ve to follow the command ‘useradd‘ or ‘adduser‘ with ‘username’. The ‘username’ is a user login name, that is used by user to login into the system.
+
+Only one user can be added and that username must be unique (different from other username already exists on the system).
+
+For example, to add a new user called ‘aadhar‘, use the following command.
+
+
+~~~ bash
+$ useradd aadhar
+~~~
+
+
+
+
+
+