splitt system and add config management

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diff --git a/docs/system/systemusers.rst b/docs/system/systemusers.rst
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+.. _systemusers:
+
+System Users
+------------
+
+VyOS supports two levels of users: admin and operator.
+
+The operator level restricts a user to operational commands and prevents
+changes to system configuration. This is useful for gathering information
+about the state of the system (dhcp leases, vpn connections, routing tables,
+etc...) and for manipulating state of the system, such as resetting
+connections, clearing counters and bringing up and taking down connection
+oriented interfaces.
+
+The admin level has all of the capabilities of the operator level, plus the
+ability to change system configuration. The admin level also enables a user
+to use the sudo command, which essentially means the user has root access to
+the system.
+
+Creating Login User Accounts
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Create user account `jsmith`, with `admin` level access and the password
+`mypassword`
+
+.. code-block:: sh
+
+  set system login user jsmith full-name "Johan Smith"
+  set system login user jsmith authentication plaintext-password mypassword
+  set system login user jsmith level admin
+
+The command:
+
+.. code-block:: sh
+
+  show system login
+
+will show the contents of :code:`system login` configuration node:
+
+.. code-block:: sh
+
+  user jsmith {
+      authentication {
+          encrypted-password $6$0OQHjuQ8M$AYXVn7jufdfqPrSk4/XXsDBw99JBtNsETkQKDgVLptXogHA2bU9BWlvViOFPBoFxIi.iqjqrvsQdQ./cfiiPT.
+          plaintext-password ""
+      }
+      full-name "Johan Smith"
+      level admin
+  }
+
+SSH Access using Shared Public Keys
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The following command will load the public key `dev.pub` for user `jsmith`
+
+.. code-block:: sh
+
+  loadkey jsmith dev.pub
+
+.. note:: This requires uploading the `dev.pub` public key to the VyOS router
+   first. As an alternative you can also load the SSH public key directly
+   from a remote system:
+
+.. code-block:: sh
+
+  loadkey jsmith scp://devuser@dev001.vyos.net/home/devuser/.ssh/dev.pub
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