Add link to Qt for Automation from Qt's value-add listing

Task-number: QTBUG-66573
Change-Id: Ica4b804ea55b7d4bd21a60a83db6f841d7453eb8
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

doc/src/external-resources.qdoc

@@ -326,3 +326,8 @@
     \externalpage https://wiki.openssl.org/images/7/70/Setenv-android.sh
     \title OpenSSL: Build Setup Script
 */
+
+/*!
+    \externalpage http://doc.qt.io/QtForAutomation/index.html
+    \title Qt for Automation
+*/

doc/src/qtmodules.qdoc

@@ -379,6 +379,9 @@
     \header
         \li Feature
         \li Description
+    \row
+         \li \l{Qt for Automation}
+         \li Libraries and Tools for automation related domains such as KNX, OPC UA and MQTT.
     \row \li \l{Qt for Device Creation}
          \li Tools for fast, easy, and fully-integrated embedded device application development.
              Includes most other Value-Add features.