Add docs about extracting database from app

support/troubleshooting/appdatabase.rst

@@ -0,0 +1,30 @@
+Extract app databases from device
+=================================
+
+To help with fixing bugs, there may be some times when accessing the actual
+data in the local database for the device can be helpful. The steps below
+describe how to get this data:
+
+
+#. First of all, you'll need Android Studio version 4.2 or higher. Download the latest version for your 
+operating system from the official page: https://developer.android.com/studio
+#. Enable USB debugging on your phone/device (under Settings > System > Developer Options, you may need
+to enable developer options first - see: https://android.tutorials.how/enable-developer-options/)
+#. Connect the device to your computer and open the app
+#. Under Android Studio, from the menu bar select View > Tool Windows > App Inspection.
+#. Select the Database Inspector tab and then select device and the Oppia app running process from the menu
+#. The databases in the currently running app appear in the Databases pane, you should be able to see at
+least ``mobilelearning.db`` and ``oppia.db``
+
+#. Right click in the ``mobilelearning.db`` database icon and select "Export as file"
+
+.. image:: images/export-db.png
+    :align: center
+
+#. In the dialog, select SQL as the file type, and click the export button.
+
+.. image:: images/export-db-dialog.png
+    :align: center
+
+Now, you have a backup of your app's current database state, that can be used to recreate
+any ongoing issue by a developer.

support/troubleshooting/index.rst

@@ -9,3 +9,4 @@ Troubleshooting an Oppia Implementation
    block
    translations
    debug
+   appdatabase