The changes made in this commit include:

- Updated README.md
- Added images for data import instructions

Author: BrainIsDead

README.md

@@ -79,3 +79,50 @@ Open `http://localhost:8000` to view it in the browser
 
 ## [Django admin](https://docs.djangoproject.com/en/4.1/ref/contrib/admin/) web interface (user should be `is_staff` or `is_superuser`)
 `http://localhost:8000/admin`
+
+
+## Import data from admin interface
+
+For data import used [django-import-export](https://django-import-export.readthedocs.io/en/latest/index.html) library
+
+The code consists of Django resource classes that are used for importing and exporting CSV files using the Django Import-Export library:
+1. `SignalResource` - this resource class is used for importing `Signal` models:
+    * Defines various fields such as `name`, `display_name`, `pathogen`, `signal_type`, and `source`.
+    * Defines the `before_import_row` method, which is called before importing each row and allows for pre-processing of the data.
+    * Includes methods like `is_url_in_domain` to check if a URL belongs to a specific domain, `fix_boolean_fields` to handle boolean fields, and `process_links` to process the links field.
+
+2. `SignalBaseResource` - This resource class is used for updating already created `Signal` models `base` fields with base Signals.
+    * Defines various fields such as `name`, `display_name`, `base`, and `source`.
+    * Defines the `before_import_row` method, which is called before importing each row and allows for pre-processing of the data.
+    * The `process_base` method is responsible for processing the `base` field by retrieving the corresponding `Signal` object based on the provided `name` and `source`.
+
+3. `SourceSubdivisionResource` - this resource class is used for importing `SourceSubdivision` models
+    * It defines fields such as `name`, `display_name`, `description`, `data_source`, and `links`.
+    * It includes the `before_import_row` method for pre-processing each row before importing.
+    * The `process_links` method is responsible for processing the `links` field by creating `Link` objects based on the provided URLs.
+    * The `process_datasource` method processes the `data_source` field by creating or retrieving a `DataSource` object based on the provided name.
+
+These resource classes provide a structured way to import CSV files. They define the fields, handle pre-processing of data, and interact with the corresponding models and related objects.
+
+### Import data flow
+
+To import data from a CSV file must meet the requirements:
+* CSV file should be properly formatted and contains all the required fields for importing, as specified by the resource classes (`SignalResource`, `SignalBaseResource`, `SourceSubdivisionResource`). The header row of the CSV file should match the field names defined in the resource classes.
+* It should not contain empty rows from the CSV file before importing. Empty rows may cause validation errors during the import process.
+* Colums should be saparateb by `","`
+
+Othervice you will receive Errors during import process:
+![Import errors](./docs/image-3.png)
+
+
+1. Import `SourceSubdivision` instances with `SourceSubdivisionResource` - [http://localhost:8000/admin/datasources/sourcesubdivision/import/](http://localhost:8000/admin/datasources/sourcesubdivision/import/)
+![Import `SourceSubdivision` instances](./docs/image.png)
+![Confirm importing `SourceSubdivision` instances](./docs/image-1.png)
+
+2. Import `Signal` instances with `SignalResource` - [http://localhost:8000/admin/signals/signal/import/](http://localhost:8000/admin/signals/signal/import/)
+![Import `Signal` instances](./docs/image-2.png)
+![Confirm importing `Signal` instances](./docs/image-4.png)
+
+3. Import `Signal.base` fields with `SignalBaseResource` - [http://localhost:8000/admin/signals/signal/import/](http://localhost:8000/admin/signals/signal/import/)
+![Import `Signal.base` field](./docs/image-5.png)
+![Confirm importing `Signal.base` fields](./docs/image-6.png)