Fix Guides in hawkBit Documentation. (#2826)

* Fix Guides in hawkBit Documentation.

Signed-off-by: strailov <Stanislav.Trailov@bosch.io>

* small fixes to clustering page

Signed-off-by: strailov <Stanislav.Trailov@bosch.io>

---------

Signed-off-by: strailov <Stanislav.Trailov@bosch.io>

docs/base-setup.md

@@ -0,0 +1,68 @@
+# Base hawkBit setup
+
+In this guide we describe how to setup a full featured hawkBit based on a production ready infrastructure.  
+It is based on the hawkBit update server.
+
+The update server can in fact be run stand alone. However, only with an embedded H2, no Device Management Federation API and no artifact storage.
+
+---
+
+### System Architecture
+
+This guide describes a target architecture that is more like one that you will expect in a production system:
+
+- [hawkBit](https://github.com/eclipse-hawkbit/hawkbit/tree/master/hawkbit-monolith/hawkbit-update-server) Update Server
+- [MariaDB](https://mariadb.org/) for the repository  
+- [RabbitMQ](https://www.rabbitmq.com/) for DMF communication
+
+---
+
+### Prerequisites
+
+- You have a working hawkBit [core build](https://github.com/eclipse-hawkbit/hawkbit).  
+
+As mentioned you can create your own application with hawkBit inside.
+
+---
+
+### Configure MariaDB/MySQL connection settings
+
+For this you can either edit the existing `application.properties` or [create a new profile](http://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#boot-features-external-config-profile-specific-properties):
+
+```properties
+spring.jpa.database: MYSQL
+spring.datasource.url: jdbc:mariadb://localhost:3306/YOUR_SCHEMA
+spring.datasource.username: YOUR_USER
+spring.datasource.password: YOUR_PWD
+spring.datasource.driverClassName: org.mariadb.jdbc.Driver
+```
+
+> **Note:** On Ubuntu 18.04 with MariaDB 10.1 installed from the default repository via `apt install`,  
+> the `COLLATE` option of database has to be changed manually to `latin1`.  
+> For recent versions of MariaDB running on Ubuntu this is not required. (cf. [issue](https://github.com/eclipse-hawkbit/hawkbit/issues/963))
+
+---
+
+### Configure RabbitMQ (optional)
+
+Defaults are already provided for a standard Rabbit installation. Otherwise configure the following in `application.properties` of the two services:
+
+```properties
+spring.rabbitmq.username: guest
+spring.rabbitmq.password: guest
+spring.rabbitmq.virtualHost: /
+spring.rabbitmq.host: localhost
+spring.rabbitmq.port: 5672
+```
+
+---
+
+### Compile & Run
+
+#### Compile & Run your app
+See [update server](https://github.com/eclipse-hawkbit/hawkbit/tree/master/hawkbit-monolith/hawkbit-update-server)
+
+---
+
+Enjoy hawkBit with a real database, artifact storage and all interfaces available.
+