Created enum AlarmPeriod (markdown)

enum-AlarmPeriod.md

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+The AlarmPeriod represents the common alarm intervals used.  This can be used as the period argument for the AddAlarm() method.  
+
+```
+enum AlarmPeriod
+{
+    AlarmPeriod_SingleFire,
+    AlarmPeriod_Yearly, 
+    AlarmPeriod_Monthly, 
+    AlarmPeriod_Monthly_LastDay,
+    AlarmPeriod_Weekly, 
+    AlarmPeriod_Daily,
+    AlarmPeriod_Hourly
+};
+```
+
+### AlarmPeriod_SingleFire
+The alarm will trigger once at the given date and time and then get removed.
+
+### AlarmPeriod_Yearly
+The alarm will trigger once per year at the given date and time.  If the first year, month, and day is a leap day in a leap year, it will honor this on subsequent leap years, but it will still trigger on Feb 28th on non-leap years.  
+
+### AlarmPeriod_Monthly
+The alarm will trigger once per month on the given day of the month and time.  If the first day of the month is greater than a day of the month on subsequent months, then it will still trigger but on last day of that month.  
+
+### AlarmPeriod_Monthly_LastDay
+The alarm will trigger once per month on the last day of the month at the given time.  
+
+### AlarmPeriod_Weekly
+The alarm will trigger once per week on the same day of the week as the given date and time.  
+
+### AlarmPeriod_Daily
+The alarm will trigger once per day at the given time.
+
+### AlarmPeriod_Hourly
+The alarm will trigger once per hour at the given minutes and seconds past the hour.