Update documentation

Add more documentation for the Web application.

Issue-ID: OAM-18
Signed-off-by: demx8as6 <martin.skorupski@highstreet-technologies.com>
Change-Id: I928ab076b3144c6b01647fedaaf8b23a551173f5
diff --git a/docs/config.rst b/docs/config.rst
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+.. contents::
+   :depth: 3
+..
+
+Configuration
+=============
+
+The application shows the actual values of all attributes of the
+ONF-TR-532 for a selected physical network function (PNF). Each view of
+a functional element is divided into capabilities, configuration,
+status, current problem, current performance and history performance
+information according to TR-532.
+
+A separate window is available for modifying the configuration. All
+changes made are sent to the device in a single NetConf bulk request.
+The operator is notified about successfully configuring the device.
+
+Implementation
+--------------
+
+The application is implemented as ODLUX web application using the
+RestConf northbound interface of the SDN controller. The key frameworks
+are: Typescript, React and material-ui.
+
+Connection status information is updated automatically using a web
+socket for notifications from OpenDaylight to the browser.