add json config file

config/stdd.json

@@ -0,0 +1,10 @@
+{
+            "hw_address": "",
+            "blink_colon": false,
+            "brightness_high": 15,
+            "brightness_low": 2,
+            "set_brightness_low": "00:00",
+            "set_brightness_high": "00:00",
+            "syslog_level": "info",
+            "syslog_facility": "user"
+}