Add basic import/export documentation to README

README.md

@@ -23,6 +23,9 @@ guess work.
   - [Manual](#manual)
 - [Configuration](#configuration)
 - [Languages](#languages)
+- [Import/Export](#import-export)
+  - [Export](#export)
+  - [Import](#import)
 - [API](#api)
   - [Authentication](#authentication)
   - [`GET` Method](#get-method)
@@ -390,6 +393,50 @@ create/update translations.
 
 :tr: Turkish
 
+## Import/Export
+
+Baby Buddy uses the [django-import-export application](https://django-import-export.readthedocs.io/)
+to provide import and export functionality.
+
+### Export
+
+Export actions are accessible from Baby Buddy's "Database Admin" area (the
+Django admin interface). For example, to export all diaper change entries from
+Baby Buddy as an Excel file:
+
+1. Log in as a user with "staff" access.
+
+1. From the user menu, click "Database Admin" under the "Site" heading.
+
+1. Click "Diaper Changes" in the list of data types.
+
+1. Click the "Export" button above the filters list on the right side of the
+screen.
+
+1. Select the "xlxs" format and click "Submit"
+
+Note: any applied filters will also filter the exported entries. Alternatively,
+on the Diaper Change list screen (step 3 above), it is possible to select one
+or many individual records and select "Export selected Diaper Changes" from the
+"Actions" list.
+
+### Import
+
+Import actions are accessible from Baby Buddy's "Database Admin" area (the
+Django admin interface). From the list of entry types in the Database Admin,
+select the type to import and click the "Import" button on the list page. The
+import screen for a particular type will list the fields generally expected to
+be present for an import. Multiple file types -- including csv, xlsx, etc. --
+are supported for the import.
+
+The import pages do not provide *detailed* information about the required data
+and formats. When an import is attempted, all rows will be checked for errors
+and any issues will be reported on screen and will need to be resolved before
+the import can be performed.
+
+See the [example import files](core/tests/import) used for tests to get an idea
+of the expected data format.
+
 ## API
 
 Baby Buddy uses the [Django REST Framework](https://www.django-rest-framework.org/)