Add --notes when adding reminders (#56)

```
reminders add todo some reminder --notes "some notes"
```

It also shows up in `reminders show`

Fixes #54

Sources/RemindersLibrary/CLI.swift

@@ -90,9 +90,15 @@ private struct Add: ParsableCommand {
         help: "The priority of the reminder")
     var priority: Priority = .none
 
+    @Option(
+        name: .shortAndLong,
+        help: "The notes to add to the reminder")
+    var notes: String?
+
     func run() {
         reminders.addReminder(
             string: self.reminder.joined(separator: " "),
+            notes: self.notes,
             toListNamed: self.listName,
             dueDate: self.dueDate,
             priority: priority)

Sources/RemindersLibrary/Reminders.swift

@@ -20,7 +20,8 @@ private func format(_ reminder: EKReminder, at index: Int, listName: String? = n
     let dateString = formattedDueDate(from: reminder).map { " (\($0))" } ?? ""
     let priorityString = Priority(reminder.mappedPriority).map { " (priority: \($0))" } ?? ""
     let listString = listName.map { "\($0): " } ?? ""
-    return "\(listString)\(index): \(reminder.title ?? "<unknown>")\(dateString)\(priorityString)"
+    let notesString = reminder.notes.map { " (\($0))" } ?? ""
+    return "\(listString)\(index): \(reminder.title ?? "<unknown>")\(notesString)\(dateString)\(priorityString)"
 }
 
 public enum DisplayOptions: String, Decodable {
@@ -251,11 +252,18 @@ public final class Reminders {
         semaphore.wait()
     }
 
-    func addReminder(string: String, toListNamed name: String, dueDate: DateComponents?, priority: Priority) {
+    func addReminder(
+        string: String,
+        notes: String?,
+        toListNamed name: String,
+        dueDate: DateComponents?,
+        priority: Priority)
+    {
         let calendar = self.calendar(withName: name)
         let reminder = EKReminder(eventStore: Store)
         reminder.calendar = calendar
         reminder.title = string
+        reminder.notes = notes
         reminder.dueDateComponents = dueDate
         reminder.priority = Int(priority.value.rawValue)