Update awesome_lib.h

awesome_lib/awesome_lib.h

-
 #ifndef AWESOME_LIB_H
 #define AWESOME_LIB_H
 
@@ -699,4 +698,9 @@ void memes(int a=0) {
 
 }
 
+// wait until the serial monitor receives something
+void wait_for_serial_input() {
+  while(Serial.available() == 0) {}
+}
+
 #endif  // AWESOME_LIB_H