4: Add new AlarmSeverity enum

src/main/tjava/com/r35157/jupiterperpsalarm/AlarmSeverity.tjava

@@ -0,0 +1,9 @@
+package com.r35157.jupiterperpsalarm;
+
+public enum AlarmSeverity {
+    EMERGENCY,  // Repeated wake-up alarm
+    CRITICAL,   // One-shot wake-up alarm
+    WARN,       // Audible warning respecting quiet hours
+    INFO,       // Low-priority visible notification
+    SILENT      // No user interruption
+}