Add kate-admin-helper plugin for elevated file access

This plugin provides automatic privilege elevation for the Kate editor using the `admin://` KIO protocol. It ensures secure handling of files requiring root permissions and prevents running Kate as root, adhering to KDE security practices.

plugins/kate-admin-helper/README.md

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+# kate-admin-helper
+
+This plugin provides an automatic privilege elevation helper for **Kate** (KDE text editor) when opening files in zsh.
+
+When opening files that the user does not have write access to, the plugin automatically uses the `admin://` KIO protocol, allowing **Kate** to request privilege elevation via Polkit.  
+This avoids running the entire **Kate** process as root and follows modern KDE security practices.
+
+If privilege elevation is needed, a message will be shown, and the user will be prompted to authenticate with their password through Polkit.
+
+## Installation
+
+Add `kate-admin-helper` to your plugin list in `~/.zshrc`:
+
+```zsh
+plugins=(
+  ...
+  kate-admin-helper
+)
+```
+
+## Usage
+
+Open files as usual:
+
+```zsh
+kate /etc/hosts
+kt /etc/fstab /etc/ssh/sshd_config
+```
+
+If the file requires elevated privileges to edit, it will be opened automatically with `admin://`.  
+A colored message will inform you that privilege elevation is needed, and a Polkit prompt will ask for your password.
+
+The `kt` command is also available and behaves the same way.
+
+## Requirements
+
+- **Kate** installed
+- **kio-admin** installed
+- A running **Polkit authentication agent** (e.g., `polkit-kde-agent-5` or `polkit-kde-agent-6`)
+- `pkexec` available to create new files if needed