added an example

example_playbooks/mainnet_with_snapshots_recovery/README.md

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+# Mainnet Snapshots Recovery playbook
+
+This directory is simple example how to set up EN using this role. It comes with snapshots recovery enabled by default.\
+**Note that for simplicity it's using postgres database
+with a very unsecure password and the EN is just started on the same machine**
+
+To run this playbook, first install dependencies
+
+```shell
+ ansible-galaxy install -r requirements.yml
+ ``` 
+
+and then you can run the playbook using
+
+```shell
+ ansible-playbook playbook.yml -i hosts.ini -K
+ ``` 
+
+To see logs you can use
+
+```shell
+ docker logs en-external_node-1 
+ ``` 

example_playbooks/mainnet_with_snapshots_recovery/hosts.ini

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+[local]
+localhost ansible_connection=local

example_playbooks/mainnet_with_snapshots_recovery/playbook.yml

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+- hosts: all
+  become: true
+  vars:
+    database_name: "zksync_ext_node_mainnet"
+    database_username: "postgres"
+    database_password: "notsecurepassword"
+    eth_l1_url: "https://ethereum-rpc.publicnode.com"
+    main_node_url: "https://zksync2-mainnet.zksync.io"
+    l1_chain_id: "1"
+    l2_chain_id: "324"
+    enable_snapshots_recovery: true
+    snapshots_bucket_base_url: "zksync-era-mainnet-external-node-snapshots"
+
+  roles:
+    - external_node

example_playbooks/mainnet_with_snapshots_recovery/requirements.yml

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+---
+roles:
+  - name: geerlingguy.docker
+    src: https://github.com/geerlingguy/ansible-role-docker
+    version: "7.1.0"
+
+  - name: external_node
+    src: https://github.com/matter-labs/ansible-en-role
+    version: "v3.0.0"
+
+collections:
+  - name: community.general
+    version: 8.4.0