Implement the "an" feature: Adding notes to todos

This patch introduce a new attribute of a todo item, which is
"Notes", of type []string.  The following enhancing patches will
contain the listing, removing and editing features.

1 files changed, 7 insertions, 0 deletions

diff --git a/todo.go b/todo.go
index 1eea73c..77faccb 100644
--- a/todo.go
+++ b/todo.go
@@ -122,6 +122,11 @@ func usage() {
 	yellow.Println("\ttodo d 33")
 	fmt.Println("\tDeletes a todo with id 33\n")
 
+	blueBold.Println("\nManipulating notes")
+	fmt.Println("  You can add additional information to a existing todo.\n")
+	yellow.Println("\ttodo an 12 check http://this.web.site")
+	fmt.Println("\tAdds notes \"check http://this.web.site\" to the todo with id 12\n")
+
 	blueBold.Println("\nGarbage Collection")
 	yellow.Println("\ttodo gc")
 	fmt.Println("\tDeletes all archived todos.\n")
@@ -153,6 +158,8 @@ func routeInput(command string, input string) {
 		app.EditTodo(input)
 	case "ex", "expand":
 		app.ExpandTodo(input)
+	case "an":
+		app.ManipulateNotes(input)
 	case "gc":
 		app.GarbageCollect()
 	case "p", "prioritize":