Add base eirene config

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

README.md

@@ -26,6 +26,10 @@ The below installation example is for a fresh `eirene-vm` virtual machine.
    mkdir -p /mnt/persist/etc/ssh
    ssh-keygen -t ed25519 -f /mnt/persist/etc/ssh/ssh_host_ed25519_key
    cp /mnt/persist/etc/ssh/ssh_host_ed25519_key /host/hosts/eirene/secrets/ssh_host_ed25519_key
+
+   # Optional - Copy user keys
+   mkdir -p /mnt/persist/home/nick/.local/share/sops-nix
+   cp /host/users/nick/secrets/key.txt /mnt/persist/home/nick/.local/share/sops-nix/key.txt
    ```
 
 4. Update `sops` Configuration