Added create your first admin user part in documentation.

README.md

@@ -29,6 +29,7 @@ This repository includes:
   - [Test your setup](#test-your-setup)
     - [Using the `status` command:](#using-the-status-command)
     - [Using the `test_setup` command:](#using-the-test_setup-command)
+  - [Create your first admin user](#create-your-first-admin-user)
 
 
 ## Getting Started
@@ -217,6 +218,26 @@ Config file loaded successfully.
 +-------------------------------------------+
 ```
 
+
+
+## Create your first admin user
+
+We recommend creating one admin user, and use that to create normal users via the API.
+
+To create your first admin user, simply use the `create_user` command:
+
+```bash
+$ db-middleware create_user
+Config file loaded successfully.
+Enter username: myadmin
+Enter role (admin/user): admin
+
++-----------------------------------------------------------------------------+
+| > User 'myadmin' with role 'admin' created successfully.                    |
+| > API Key: 4887f28e378dfd99e622833ccbebc174a45d                             |
++-----------------------------------------------------------------------------+
+```
+
 ---