Add documentation for ProxmoxVE integration (#10660)

* Added documentation for ProxmoxVE integration

* Fix ha_release version for ProxmoxVE integration

Co-Authored-By: Klaas Schoute <klaas_schoute@hotmail.com>

* ✏️ Tweak

* ✏️ Tweak

* Fix ha_release field for ProxmoxVE version


Co-authored-by: Klaas Schoute <klaas_schoute@hotmail.com>
Co-authored-by: Franck Nijhof <git@frenck.dev>

source/_integrations/proxmoxve.markdown

@@ -0,0 +1,100 @@
+---
+title: "Proxmox VE"
+description: "Access your ProxmoxVE instance in Home Assistant."
+logo: proxmoxve.png
+ha_category:
+  - Binary Sensor
+ha_release: 0.103
+ha_iot_class: Local Polling
+---
+
+[Proxmox VE](https://www.proxmox.com/en/) is an open-source server virtualization environment. This integration allows you to poll various data from your instance.
+
+After configuring this component, the binary sensors automatically appear.
+
+## Configuration
+
+<div class='note'>
+You should have at least one VM or container entry configured, else this integration won't do anything.
+</div>
+
+To use the `proxmoxve` component, add the following config to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+proxmox:
+  - host: IP_ADDRESS
+    username: USERNAME
+    password: PASSWORD
+    nodes:
+      - node: NODE_NAME
+        vms:
+          - VM_ID
+        containers:
+          - CONTAINER_ID
+```
+
+{% configuration %}
+host:
+  description: IP address of the Proxmox VE instance.
+  required: true
+  type: string
+port:
+  description: The port number on which Proxmox VE is running.
+  required: false
+  default: 8006
+  type: integer
+verify_ssl:
+  description: Whether to do strict validation on SSL certificates.
+  required: false
+  default: true
+  type: boolean
+username:
+  description: The username used to authenticate.
+  required: true
+  type: string
+password:
+  description: The password used to authenticate.
+  required: true
+  type: string
+realm:
+  description: The authentication realm of the user.
+  required: false
+  default: pam
+  type: string
+nodes:
+  description: List of the Proxmox VE nodes to monitor.
+  required: true
+  type: map
+  keys:
+    node:
+      description: Name of the node
+      required: true
+      type: string
+    vms:
+      description: List of the QEMU VMs to monitor.
+      required: false
+      type: list
+    containers:
+      description: List of the LXC containers to monitor.
+      required: false
+      type: list
+{% endconfiguration %}
+
+Example with multiple VMs and no containers:
+
+```yaml
+proxmox:
+  - host: IP_ADDRESS
+    username: USERNAME
+    password: PASSWORD
+    nodes:
+      - node: NODE_NAME
+        vms:
+          - VM_ID_1
+          - VM_ID_2
+```
+
+## Binary Sensor
+
+The integration will automatically create a binary sensor for each tracked VM or container, the binary sensor will either be on if the VM's state is running or off if the VM's state is different.