Update docs

README.md

@@ -4,9 +4,11 @@ SSH-based network device configuration backup tool with support for multiple dev
 
 ## Features
 
-- **Multi-device backup**: Configure multiple devices in YAML, with `!include` directives
+- **Multi-device backup**: Configure multiple devices across multiple YAML files with automatic merging
 - **Device type templates**: Reusable command sets per device type, overridable per individual device
-- **Flexible authentication**: SSH agent, key files, or password
+- **Flexible authentication**: SSH agent, key files, or password with SSH config support
+- **SSH config integration**: Automatically uses `~/.ssh/config` settings for legacy device compatibility
+- **Modular configuration**: Load and merge multiple YAML files for organized configuration management
 
 ## Quick Start
 
@@ -24,18 +26,7 @@ make build
 
 1. **Create configuration files**:
 
-   **Main config** (`config.yaml`):
-   ```yaml
-   devices:
-     asw100:
-       user: netops
-       type: srlinux
-     asw120:
-       user: netops
-       type: srlinux
-   ```
-
-   **Device types** (`00-device-types.yaml`):
+   **Device types** (`yaml/00-device-types.yaml`):
    ```yaml
    types:
      srlinux:
@@ -43,16 +34,34 @@ make build
          - show version
          - show platform linecard
          - info flat from running
+     centec:
+       commands:
+         - show version
+         - show running-config
+   ```
+
+   **Device config** (`yaml/config.yaml`):
+   ```yaml
+   devices:
+     asw100:
+       user: netops
+       type: srlinux
+     switch01:
+       user: admin
+       type: centec
    ```
 
 2. **Run backup**:
 
 ```bash
-# Backup all devices
-ipng-router-backup --yaml *.yaml --output-dir /backup
+# Backup all devices (multiple YAML files are automatically merged)
+ipng-router-backup --yaml yaml/00-device-types.yaml --yaml yaml/config.yaml --output-dir /backup
+
+# Or use wildcards
+ipng-router-backup --yaml yaml/*.yaml --output-dir /backup
 
 # Backup specific devices
-ipng-router-backup --yaml *.yaml --host asw100 --output-dir /backup
+ipng-router-backup --yaml yaml/*.yaml --host asw100 --output-dir /backup
 ```
 
 3. **Check output**:
@@ -73,9 +82,25 @@ cat /backup/asw100
 The tool automatically tries authentication methods in this order:
 
 1. **SSH Agent** (if `SSH_AUTH_SOCK` is set)
-2. **SSH Key File** (`--key-file` or default locations)
+2. **SSH Key File** (`--key-file` or from `~/.ssh/config`)
 3. **Password** (`--password` flag)
 
+## SSH Configuration
+
+The tool integrates with `~/.ssh/config` for seamless connection to legacy devices:
+
+```bash
+# ~/.ssh/config
+Host old-router*
+  User admin
+  Port 2222
+  KexAlgorithms +diffie-hellman-group1-sha1
+  Ciphers aes128-cbc,aes192-cbc,aes256-cbc
+  HostKeyAlgorithms +ssh-rsa
+```
+
+This allows connecting to older routers that require legacy SSH algorithms while maintaining security for modern devices.
+
 ## Documentation
 
 - **[Detailed Documentation](docs/DETAILS.md)** - Complete feature guide, configuration reference, and examples