Add 'proxmox_backup_client'

proxmox_backup_client.md

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+# Proxmox Backup Client
+
+## Installation
+
+### Debian 12
+
+Until now (2023-06-27) you have to use the `pvetest` repository. (Ref: [1](https://bugzilla.proxmox.com/show_bug.cgi?id=4191#c6), [2](https://forum.proxmox.com/threads/proxmox-ve-8-0-beta-released.128677/))
+
+Add public key:
+
+```
+sudo wget http://download.proxmox.com/debian/proxmox-release-bookworm.gpg -O /etc/apt/trusted.gpg.d/proxmox-release-bookworm.gpg
+```
+
+Add repository:
+
+```
+sudo nano /etc/apt/sources.list.d/proxmox.list
+```
+
+With following content:
+
+```
+deb http://download.proxmox.com/debian/pve bookworm pvetest
+```
+
+After that, update apt:
+
+```
+sudo apt update
+```
+
+Now you can install `proxmox-backup-client` with:
+
+```
+sudo apt install proxmox-backup-client
+```