Create development.md

documentation/docs/admin/customize/development.md

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+---
+sidebar_position: 6
+---
+
+# Development
+
+
+
+## Running Custom Code
+
+### Run custom code on OpenPanel installation
+
+To execute custom code following the installation of OpenPanel, place your custom script on the server. When initiating the OpenPanel installation process, use the `--post_install=` flag and specify the path to your script within it.
+Example:
+
+```bash
+ --post_install=/root/my_custom_script.sh
+```