Add Scripts/Bash/Install QEMU Guest Agent.md

Scripts/Bash/Install QEMU Guest Agent.md

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+**Purpose**:
+You may need to install the QEMU guest agent on linux VMs manually, while Windows-based devices work out-of-the-box after installing the VirtIO guest tools installer.
+
+=== "Ubuntu Server"
+
+    ``` sh
+    sudo su
+    apt update && apt -y install qemu-guest-agent
+    systemctl enable --now qemu-guest-agent
+    ```
+
+=== "Rocky Linux"
+
+    ``` sh
+    PLACEHOLDER
+    ```