add yaml include feature

README.md

@@ -6,6 +6,7 @@ SSH-based network device configuration backup tool with support for multiple dev
 
 - **Multi-device backup**: Configure multiple routers in YAML
 - **Device type templates**: Reusable command sets per device type
+- **Configuration includes**: Split large configs with `!include` directives
 - **Flexible authentication**: SSH agent, key files, or password
 - **Selective execution**: Backup specific devices with `--host` flags
 - **Professional CLI**: Standard flags, version info, and help
@@ -24,24 +25,30 @@ make build
 
 ### Basic Usage
 
-1. **Create configuration file** (`config.yaml`):
+1. **Create configuration files**:
 
-```yaml
-types:
-  srlinux:
-    commands:
-      - show version
-      - show platform linecard
-      - info flat from running
+   **Main config** (`config.yaml`):
+   ```yaml
+   !include device-types.yaml
 
-devices:
-  asw100:
-    user: admin
-    type: srlinux
-  asw120:
-    user: admin  
-    type: srlinux
-```
+   devices:
+     asw100:
+       user: admin
+       type: srlinux
+     asw120:
+       user: admin
+       type: srlinux
+   ```
+
+   **Device types** (`device-types.yaml`):
+   ```yaml
+   types:
+     srlinux:
+       commands:
+         - show version
+         - show platform linecard
+         - info flat from running
+   ```
 
 2. **Run backup**: