Added readme

Author: Dmitry Berezovsky

modules/domain_controller/README.MD

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+Domain Controller
+=================
+
+TBD: Description, purpose
+
+Installation guide
+------------------
+
+1. Add terraform module to your project and pass all required variables.
+1. Apply plan and log on your VM via SSH (user name is `centos`)
+1. Switch under root user and set password
+    ```
+    sudo su
+    passwd
+    ```    
+1. Run `mount-ebs /dev/xvdb /store` to setup EBS volume. 
+Verify if volume is mounted: `df -h` you should see corresponding line
+1. Run `centos-to-clearos` to install ClearOS. At the end VM should reboot.
+1. Open your browser and navigate to `https://YOUR-PUBLIC-IP:81/`. 
+Use login `root` and password you previously created.
+1. Go though on boarding wizard:
+    1. Choose Private Server Mode.
+    1. Keep network interface and DNS settings as they are 
+    (defaults should work in AWS network).
+    1. On system registration step instead of filling into the form navigate to 
+    the following url to skip registration process: `/app/base/wizard/stop`
+    1. Choose Community Edition version
+    1. Skip registration one more time
+1. Generate self-signed certificates: `System -> Settings -> Certificate Manager`
+1. Configure hostname:
+    1. Navigate to `Network -> Settings -> IP Settings`
+    1. Set hostname, internet host name and default domain
+    1. Set network mode to `Standalone`
+1. Activate LDAP directory: `Server -> Directory -> Directory Server`
+    1. Set base domain to your local base domain e.g. `myproj.lan`
+    1. You may want to update LDAP authorization settings depending on your needs 
+1. Create at least one user: `System -> Accounts -> Users`
+1. Enable firewall service: `systemctl enable firewall`
+1. Setup VPN `Network -> VPN -> OpenVPN`:
+    1. Disable default configuration
+    1. Set internet domain to public dns name of your VPN server   
+    1. Open SSH again. 
+    1. Edit file `/store/openvpn/clients.conf` and update 
+    routes or other settings if needed.
+    1. Run `chmod 600 /etc/clearos/openvpn.d/authorize`
+    1. Return to the web panel. Activate VPN service (button `Start`)
+    1. Follow user guide on setting up VPN account and verify if all work well.
+    
+    
+User guide
+----------
+
+#### Setup VPN account
+
+1. Navigate to the VPN web panel (https://YOUR-PUBLIC-IP:81/)
+1. Login with your login and temporary password
+1. Change your password
+1. Open certificates list: Click on your name on upper right conner and choose `User Certificates`
+1. Download all files from `Security sertificates` section except of `PKCS12`
+1. Choose configuration file depending your OS and download it as well.
+1. Put all downloaded files (you should have 4) in the same folder on your machine
+1. Then download VPN client from https://openvpn.net/index.php/open-source/downloads.html 
+and follow instructions to setup your connection. 
+1. Make sure to choose "Use this connection for resources on it's network" when 
+configuring client
+