Added documentation for custom repos and exporter plugin

docs/Writerside/topics/Exporter-Plugin.md

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+# Exporter Plugin
+
+The Exporter Plugin is a tool for managing the import and export of data from the HopFrame UI. It provides functionality for exporting table data into a CSV file and importing data back into the system, making data manipulation and backups more seamless.
+
+## What the Exporter Plugin Does
+
+1. **Export Table Data to CSV**
+    - The plugin allows users to export all data from a table as a CSV file.
+    - The exported file includes all non-virtual properties as table headers.
+    - The export process dynamically constructs rows for each entry in the table.
+
+2. **Import Data from CSV**
+    - Users can import a CSV file to populate or update a table.
+    - The import process reads the file, validates the headers, and creates new entries or updates existing ones.
+    - Relationships and enumerable properties are also resolved using the appropriate managers.
+
+3. **User Interface Integration**
+    - Adds two buttons, "Export" and "Import," to the page header of each table.
+        - **Export Button:** Initiates the export functionality.
+        - **Import Button:** Allows users to upload a CSV file for import.
+
+4. **Error Handling**
+    - Ensures errors during import or export (e.g., invalid file format, missing data, or system issues) are shown to the user as toast messages.
+
+## Adding the Exporter Plugin
+
+To include the Exporter Plugin in your HopFrame setup, use the `AddExporters` method provided by the `HopFrameConfiguratorExtensions`.
+
+Here’s how to register the Exporter Plugin in your application configuration:
+
+```c#
+builder.Services.AddHopFrame(options => {
+    options.AddExporters();
+});
+```
+
+The `AddExporters` method internally registers the `ExporterPlugin` and attaches its functionality to the HopFrame.
+
+## Key Features of the Export Process
+
+- **Dynamic Header Creation:** Automatically generates headers based on the table's non-virtual properties.
+- **Data Transformation:** Transforms property values into CSV-compatible formats.
+- **File Download:** Saves the generated CSV file with the table’s display name.
+
+## Key Features of the Import Process
+
+- **Header Validation:** Validates that the CSV file headers match the table's properties.
+- **Type Conversion:** Converts values in the CSV file to their respective data types.
+- **Relationship Management:** Resolves relationships and enumerable properties during import.
+
+This plugin streamlines data operations, reducing manual effort and enabling quick data migration or updates. Let me know if you’d like to dive deeper into any specific aspect!