Documentation: Add missing service configuration section

- Add comprehensive service configuration documentation to README.md
- Add detailed service configuration section to DOCUMENTATION.md
- Document service config file format and examples for SSH, RDP, VNC
- Explain service directory setup and multiple services configuration
- Include service discovery and loading information

DOCUMENTATION.md

@@ -391,6 +391,102 @@ mode = interactive
 daemon = false
 ```
 
+#### Service Configuration Files
+
+WSSSH supports multiple services per client through individual service configuration files. These files are stored in the `services-path` directory (default: `/etc/wsssh.d/`) and allow you to configure different services like SSH, RDP, VNC, etc.
+
+##### Service Configuration File Format
+Each service configuration file defines a single service with the following format:
+
+```ini
+[service_name]
+# Target host for the tunnel connection
+tunnel-host = 192.168.1.100
+
+# Target port for the tunnel connection
+tunnel-port = 22
+
+# Optional command to execute before establishing the tunnel
+# command = /usr/local/bin/setup-tunnel.sh
+
+# Protocol to use (tcp or udp, default: tcp)
+proto = tcp
+```
+
+##### Service Configuration Examples
+
+**SSH Service** (`/etc/wsssh.d/ssh.conf`):
+```ini
+[ssh]
+tunnel-host = 192.168.1.100
+tunnel-port = 22
+proto = tcp
+```
+
+**RDP Service** (`/etc/wsssh.d/rdp.conf`):
+```ini
+[rdp]
+tunnel-host = 192.168.1.100
+tunnel-port = 3389
+proto = tcp
+```
+
+**VNC Service** (`/etc/wsssh.d/vnc.conf`):
+```ini
+[vnc]
+tunnel-host = 192.168.1.100
+tunnel-port = 5900
+proto = tcp
+```
+
+**Custom Service with Setup Command** (`/etc/wsssh.d/custom.conf`):
+```ini
+[custom]
+tunnel-host = 10.0.0.5
+tunnel-port = 8080
+command = /usr/local/bin/prepare-service.sh
+proto = tcp
+```
+
+##### Service Configuration Directory Setup
+
+```bash
+# Create the services directory
+sudo mkdir -p /etc/wsssh.d/
+
+# Copy example service configurations
+sudo cp service.conf.example /etc/wsssh.d/ssh.conf
+
+# Edit the service configuration
+sudo editor /etc/wsssh.d/ssh.conf
+```
+
+##### Multiple Services Configuration
+
+You can configure multiple services by creating separate configuration files in the services directory:
+
+```bash
+# SSH service
+sudo cp service.conf.example /etc/wsssh.d/ssh.conf
+sudo editor /etc/wsssh.d/ssh.conf
+
+# RDP service
+sudo cp service.conf.example /etc/wsssh.d/rdp.conf
+sudo editor /etc/wsssh.d/rdp.conf
+
+# VNC service
+sudo cp service.conf.example /etc/wsssh.d/vnc.conf
+sudo editor /etc/wsssh.d/vnc.conf
+```
+
+##### Service Discovery and Loading
+
+- Service configuration files are loaded from the `services-path` directory specified in `wssshc.conf`
+- Multiple directories can be specified using colon separation: `/etc/wsssh.d/:/usr/local/etc/wsssh.d/`
+- Files must have a `.conf` extension
+- The section name `[service_name]` defines the service identifier used in tunnel requests
+- Services are loaded at client startup and registered with the server
+
 #### wsssh/wsscp Configuration
 
 ```ini

README.md

@@ -254,6 +254,81 @@ port = 9898
 id = client01
 ```
 
+### Service Configuration Files
+
+WSSSH supports multiple services per client through individual service configuration files. These files are stored in the `services-path` directory (default: `/etc/wsssh.d/`) and allow you to configure different services like SSH, RDP, VNC, etc.
+
+#### Service Configuration File Format (`/etc/wsssh.d/ssh.conf`)
+```ini
+[ssh]
+# Target host for the tunnel connection
+tunnel-host = 192.168.1.100
+
+# Target port for the tunnel connection
+tunnel-port = 22
+
+# Optional command to execute before establishing the tunnel
+# command = /usr/local/bin/setup-tunnel.sh
+
+# Protocol to use (tcp or udp, default: tcp)
+proto = tcp
+```
+
+#### Service Configuration File Format (`/etc/wsssh.d/rdp.conf`)
+```ini
+[rdp]
+# Target host for the tunnel connection
+tunnel-host = 192.168.1.100
+
+# Target port for the tunnel connection
+tunnel-port = 3389
+
+# Protocol to use (tcp or udp, default: tcp)
+proto = tcp
+```
+
+#### Service Configuration File Format (`/etc/wsssh.d/vnc.conf`)
+```ini
+[vnc]
+# Target host for the tunnel connection
+tunnel-host = 192.168.1.100
+
+# Target port for the tunnel connection
+tunnel-port = 5900
+
+# Protocol to use (tcp or udp, default: tcp)
+proto = tcp
+```
+
+#### Service Configuration Directory Setup
+```bash
+# Create the services directory
+sudo mkdir -p /etc/wsssh.d/
+
+# Copy example service configurations
+sudo cp service.conf.example /etc/wsssh.d/ssh.conf
+
+# Edit the service configuration
+sudo editor /etc/wsssh.d/ssh.conf
+```
+
+#### Multiple Services Configuration
+You can configure multiple services by creating separate configuration files:
+
+```bash
+# SSH service
+sudo cp service.conf.example /etc/wsssh.d/ssh.conf
+sudo editor /etc/wsssh.d/ssh.conf
+
+# RDP service
+sudo cp service.conf.example /etc/wsssh.d/rdp.conf
+sudo editor /etc/wsssh.d/rdp.conf
+
+# VNC service
+sudo cp service.conf.example /etc/wsssh.d/vnc.conf
+sudo editor /etc/wsssh.d/vnc.conf
+```
+
 ### Tools Configuration (`~/.config/wsssh/wsssh.conf`)
 ```ini
 [default]