Doc: Add Android live preview docs

Copyedit and add the documentation from https://intranet.qt.io/display/QTRD/Preview+Android+application
to the public doc repo.

Task-number: QDS-5729
Change-Id: I8324226f108549b069976b7447ae5712735c1434
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

doc/qtcreator/src/external-resources/external-resources.qdoc

@@ -157,3 +157,15 @@
     \externalpage https://microsoft.github.io/language-server-protocol/
     \title Language Server Protocol
 */
+/*!
+    \externalpage https://docs.microsoft.com/en-us/java/openjdk/download
+    \title Download OpenJDK
+*/
+/*!
+    \externalpage https://developer.android.com/studio
+    \title Download Android Studio
+*/
+/*!
+    \externalpage https://developer.android.com/studio/install
+    \title Android Studio Installation Guide
+*/

doc/qtcreator/src/qtquick/qt-design-viewer.qdoc

@@ -24,11 +24,12 @@
 ****************************************************************************/
 
 /*!
-    \previouspage creator-live-preview-devices.html
     \page qt-design-viewer.html
     \if defined(qtdesignstudio)
+    \previouspage creator-live-preview-android.html
     \nextpage studio-exporting-and-importing.html
     \else
+    \previouspage creator-live-preview-devices.html
     \nextpage creator-building-targets.html
     \endif
 

doc/qtcreator/src/qtquick/qtquick-live-preview-devices.qdoc

@@ -26,8 +26,11 @@
 /*!
     \previouspage creator-live-preview-desktop.html
     \page creator-live-preview-devices.html
+    \if defined(qtdesignstudio)
+    \nextpage creator-live-preview-android.html
+    \else
     \nextpage qt-design-viewer.html
-
+    \endif
     \title Previewing on Devices
 
     To preview UIs on Android devices, you need to enable USB debugging on them

doc/qtcreator/src/qtquick/qtquick-live-preview.qdoc

@@ -72,6 +72,14 @@
             devices is set up automatically. You only need to connect your
             devices to your system.
             \endif
+
+        \if defined(qtdesignstudio)
+        \li \l{Previewing Android applications}
+
+            You can preview Android applications live using an Android
+            emulator.
+
+        \endif
         \li \l{Previewing in Browsers}
 
             You can open \l{https://qt-webassembly.io/designviewer/}{\QDV}