chore: add documentation for export project (#15)

Author: nmerget

docs/documentation/export-project.md

@@ -0,0 +1,20 @@
+# Export Project
+
+## Download Export Templates
+
+First, download the template files for your target operating system:
+
+<div id="release-selector"></div>
+
+## Configure Export Settings
+
+1. In the Godot editor, go to **Project → Export...**
+2. Click **Add** to add a new export preset
+3. Select your target operating system from the list
+![Export project add operating system](images/export_project_add.png)
+4. Check the **Advanced Options** checkbox
+![Export project paths](images/export_project_paths.png)
+5. Set the template paths:
+   - **Release Template**: Path to the release template file you downloaded
+   - **Debug Template**: Path to the debug template file you downloaded
+Your project is now ready to export for the selected platform.

docs/documentation/images/export_project_add.png

@@ -13,6 +13,7 @@ nav:
   - Docs:
       - Getting Started: documentation/getting-started.md
       - Use External Editor: documentation/use-external-editor.md
+      - Export Project: documentation/export-project.md
       - Scripting:
           - Intro: documentation/godot-js-scripts/intro.md
           - Decorators: documentation/godot-js-scripts/decorators.md