add doc ref and new display function

LibreMetric.ino

@@ -9,7 +9,7 @@
 #include <DNSServer.h>
 #include <SPI.h>
 #include <Adafruit_GFX.h>
-#include <Max72xxPanel.h>
+#include <Max72xxPanel.h>  // https://github.com/markruys/arduino-Max72xxPanel
 #include <time.h>
 #include <ArduinoOTA.h>
 
@@ -195,7 +195,9 @@ void loop() {
   ArduinoOTA.handle();
   yield();
 }
-
+void display_static_message(String message){
+  
+}
 void display_message(String message){
    for ( int i = 0 ; i < width * message.length() + matrix.width() - spacer; i++ ) {
     matrix.fillScreen(LOW);