Add guide to add park layer to add site form (#26)

Add gude to add park layer to add site form

docs/src/administrator/park-layer/add-park-layer.md

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+---
+title: BIMS Documentation
+summary: Central documentation site for BIMS projects
+    - Dimas Ciputra
+date: 14-10-2024
+some_url: https://github.com/kartoza/bims-website
+copyright: Copyright 2024, Kartoza
+contact:
+license: This program is free software; you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.
+#context_id: 1234
+---
+
+# Adding a Park Layer to the "Add Site" Form
+
+This guide will help you fetch the park name from a spatial layer on the "Add Site" form, following the steps outlined below:
+
+![Inline image](img/Screenshot%202024-10-14%20at%2014.53.44.png)
+
+## Step 1: Upload the Layer
+
+As a superuser, navigate to the layer upload page at /upload-spatial-layer/ to upload your shapefiles. When prompted, give the layer an appropriate name based on your needs.
+
+![Inline image](img/Screenshot%202024-10-14%20at%2014.48.33.png)
+
+After uploading, wait until the process is completed. The upload status will change to "Success" once it's finished.
+
+## Step 2: Select the Layer in Site Settings
+
+Next, go to the admin page and select Site Setting by visiting /admin/bims/sitesetting/. Click on the first setting that appears.
+
+Scroll down to find the Park Layer dropdown, and choose the layer you just uploaded.
+
+## Step 3: Set the Park Attribute Key
+
+Set the Park Attribute Key to specify the attribute you want to use when selecting park names from the layer’s properties.
+
+Once all these settings are configured, click Save.
+
+![Inline image](img/Screenshot%202024-10-14%20at%2014.52.03.png)
+
+Once all these settings are configured, click Save.