Add more frequencies.

lib/models/frequency.dart

@@ -1,12 +1,53 @@
 // https://www.tutorialspoint.com/dart_programming/dart_programming_enumeration.htm
 enum Frequency {
-  daily(title: "Daily"),
+  daily(
-  weekly(title: "Weekly"),
+    title: "Daily",
-  biweekly(title: "Biweekly"),
+    hint: "Once Per Day",
-  montly(title: "Monthly"),
+    timesPerYear: 364.25,
-  yearly(title: "Yearly");
+  ),
+  weekly(
+    title: "Weekly",
+    hint: "Once Per Week",
+    timesPerYear: (364.25/7),
+  ),
+  biweekly(
+    title: "Biweekly",
+    hint: "Every Other Week",
+    timesPerYear: (364.25/7/2),
+  ),
+  bimonthly(
+    title: "Bimonthly",
+    hint: "Twice Per Month",
+    timesPerYear: 24,
+  ),
+  montly(
+    title: "Monthly",
+    hint: "Once Per Month",
+    timesPerYear: 12,
+  ),
+  quarterly(
+    title: "Quarterly",
+    hint: "Every Three Months",
+    timesPerYear: 4,
+  ),
+  biannual(
+    title: "Biannual",
+    hint: "Twice Per Year",
+    timesPerYear: 2,
+  ),
+  yearly(
+    title: "Yearly",
+    hint: "Once Per Year",
+    timesPerYear: 1,
+  );
 
-  const Frequency({required this.title});
+  const Frequency({
+    required this.title,
+    required this.hint,
+    required this.timesPerYear,
+  });
 
   final String title;
+  final String hint;
+  final double timesPerYear;
 }