add example of configuration file

contrib/yasnd.conf.example

@@ -0,0 +1,30 @@
+# hosts' list
+host 10.0.0.1 {
+	hostname = "10.0.0.1"
+	lpt_pin = 2
+}
+host 10.0.0.2 {
+	hostname = "10.0.0.2"
+	lpt_pin = 3
+}
+host 10.0.0.254 {
+	hostname = "10.0.0.254"
+	lpt_pin = 4
+}
+# log verbosity: 0 - normal mode, 1 - verbose, 2 - most verbose
+debug = 2
+# Use LPT for reset target devices?
+# Note: first LPT pin is for management and it should not be used
+lpt_enable = true
+# LPT port address(usually 0x378 is LPT1)
+lpt_port = 0x378
+# Use SMS messages for control and reports?
+sms_enable = false
+# Phone model for Gammu
+phone_model = "at"
+# Phone connection type
+phone_connection = "at"
+# Phone device
+phone_device = "/dev/ttyACM0"
+# recipient of SMS messages(if sending is enabled)
+sms_recipient = "+79999999999"